1.41.2×8.1+11×9.25+537×0.192.55555×666667+44445×666666-1555553.0.4×[11/52÷2又3/4×（4.3-1.8）]×264.（2×4×8×16×32）×（25×6.25×1.25×0.25）5.85.42×7903.29-286.5×790.329+79032.9×4.3236.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8

1.41.2×8.1+11×9.25+537×0.192.55555×666667+44445×666666-1555553.0.4×[11/52÷2又3/4×（4.3-1.8）]×264.（2×4×8×16×32）×（25×6.25×1.25×0.25）5.85.42×7903.29-286.5×790.329+79032.9×4.3236.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8
1.41.2×8.1+11×9.25+537×0.19
2.55555×666667+44445×666666-155555
3.0.4×[11/52÷2又3/4×（4.3-1.8）]×26
4.（2×4×8×16×32）×（25×6.25×1.25×0.25）
5.85.42×7903.29-286.5×790.329+79032.9×4.323
6.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8.979+9.979
7.1/18+1/54+1/108+1/270+1/378+1/504+1/648+1/810+1/990
8.（1+1）/2+（2-1）/2²+（3-1）/2³+…+（100-1）/2的一百次方
9.（1-1/2-1/3-…-1/1999）×（1/2+1/3+1/4+…+1/2000）-[（1-1/2-1/3-…-1/2000）（1/2+1/3+…+1/1999）]
10.20-{[（2²+1）/（2²-1）]+[（3²+1）/（3²-1）]+[（4²+1）/（4²-1）]+…+[（20²+1）/（20²-1）]}

1.41.2×8.1+11×9.25+537×0.192.55555×666667+44445×666666-1555553.0.4×[11/52÷2又3/4×（4.3-1.8）]×264.（2×4×8×16×32）×（25×6.25×1.25×0.25）5.85.42×7903.29-286.5×790.329+79032.9×4.3236.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8
1：原式=41.2*（10-1.9）+11*9.25+53.7*1.9=412+11*（10-0.75）+12.5*1.9=412+110-1.1*7.5+（20-7.5）*1.9=412+110+20*1.9-（1.1*7.5+1.9*7.5）=412+110+38-3*7.5=560-22.5=537.5
2：55555*666667+44445*666666-155555=
=55555*(666666+1)+44445*666666-155555
=55555*666666+55555+44445*666666-155555
=(55555+44445)*666666+55555-155555
=66666600000+55555-155555
=66666500000.
3：
4：2×4×8×16×32）×（25×6.25×1.25×0.25）=2*(4*25)*(8*1.25)*(16*6.25)*8*(4*0.25)=1600000
5：小知识：两数相乘,一个因数扩大若干倍,另一个因数缩小若干倍,积不变
85.42*7903.29-286.5*790.329+79032.9*4.323
＝854.2*790.329-286.5*790.329+790.329*432.3
＝790.329*（854.2-286.5+432.3）
＝790.329*1000
＝790329
6：1.135+3.346+5.557+7.768+9.979
1.135+3.346+5.557+（5.557+2.211)+(5.557+4.422)
//注：把7.768分成5.557+2.211,把9.979分成5.557+4.422
1.135+3.346+5.557+5.557+2.211+5.557+4.422
(1.135+4.422)+(3.346+2.211)+5.557+5.557+5.557
5.557+5.557+5.557+5.557+5.557
5.557×5＝27.785
7：1/18+1/54+1/108+1/180+1/270+1/378+1/504+1/648+1/810+1/990
=1/9(1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110)
（1/2=1-1/2,1/6=1/2-1/3,1/12=1/3-1/4……）
=1/9(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11)
=1/9(1-1/11)
=10/99
8：（3-5）²（1/2）²-（-0.125）100次方（-8）101次方
=(-2)^2(1/2)^2-(0.125)^100(-8)^100*(-8)
=(2*1/2)^2-(0.125*8)^100*(-8)
=1-1*(-8)
=1+8
=9
9：将 (1-1/2)+(1/2-1/3)+(1/3-1/4).+(1/1999-1/2000)分解（去括号）为1-2/1+2/1-3/1+3/1.+1/1999-1/2000.因为减1-2/1又加2/1,所以+2/1与-2/1互相抵消,-3/1+3/1也抵消.+1/19991与-/1999互相抵消..1没得抵消1/2000也没得抵消,只好照 算.所以：
(1-1/2)+(1/2-1/3)+(1/3-1/4).+(1/1999-1/2000)
=1-2/1+2/1-3/1+3/1.+1/1999-1/2000
=1-（2/1-2/1）-（3/1-3/1）-.（1/1999-1/1999）-1/2000
=1-1/2000
=1999/2000

4。原试=4*25

1.2＋9＝10.2
5.43－3.06＝2.37
3＋1.2＝4.2
0.12＋5＝5.12
1.2＋1.8＋1.4＝4.4
6.2＋16＋3.8＝26
14－0.6＝13.4
20.3－8＝12.3
50－1.5＋4＝ 53.5
175－0.56＝174.44
2.08＋11＝13.089
0....

全部展开

1.2＋9＝10.2
5.43－3.06＝2.37
3＋1.2＝4.2
0.12＋5＝5.12
1.2＋1.8＋1.4＝4.4
6.2＋16＋3.8＝26
14－0.6＝13.4
20.3－8＝12.3
50－1.5＋4＝ 53.5
175－0.56＝174.44
2.08＋11＝13.089
0.4＋20＝ 20.4
2.5＋67＋7.5＝77
4.5－3＝1.5
25－0.38＝1.62
5.4＋9.6＝15
5.6－4＝1.6
1.45＋55＝56.45
4.6＋49＋51＝104.6
9.1－7＝2.1
10.3－0.3＝ 10
28＋9.2＝37.2
43.6＋2.08＝45.68
14－7.4＝6.6
0.65＋4.35＝ 5
10－5.4＝4.6
1.5－0.06＝1.44
0.36＋1.54＝2
14－7.4＝6.6
0.65＋4.35＝ 5
10－5.4＝4.6
1.5－0.06＝1.44
0.36＋1.54＝2
0.75＋0.25=1
1.37+1+7.63=10
5.6+2.7+4.4=12.7
9.14-1.43-4.57=3.14
77+2.7+2.3+25=107
1.88+2.3+3.7=7.88
9.14-1.43-4.57=3.14
77+2.7+2.3+25=107
1.88+2.3+3.7=7.88
0.34+0.45=0.79
0.57+0.9=1.47
8-4.6=3.4
0.6-0.37=0.23
4.9+9.8=14.7
39.5+98.8=138.3
1.4+2.8=4.2
1.5+3=4.5
1.6+3.2=4.8
1.7+3.4=5.1
1.8+3.6=5.4
1.9+3.8=5.7
0.2+0.40=0.6
2.1+4.2=6.3
2.2+4.4=6.6
2.3+4.6=6.9
2.4+4.8=7.2
2.5+5=7.5
2.6+5.2=7.8
2.7+5.4=8.1
2.8+5.6=8.4
2.9+5.8=8.7
0.3+0.6=0.9
3.1+6.2=9.3
3.2+6.4=9.6
3.3+6.6=9.9
1-0.3=0.7
1.5-0.4=1.1
2-0.5=1.5
2.5-0.6=1.9
3.0-0.7=2.3
3.5-0.8=2.7
4-0.9=3.1
4.5-1=3.5
5-1.1=3.9
5.5-1.2=4.3
6-1.3=4.7
6.5-1.4=5.1
7-1.5=5.5
7.5-1.6=5.9
8-1.7=6.3
8.5-1.8=6.7
9-1.9=7.1
9.5-2=7.5
10-2.1=7.9
10.5-2.2=8.3
11-2.3=8.7
11.5-2.4=9.1
12-2.5=9.5
12.5-2.6=9.9
13-2.7=10.3
0.2+0.6+0.0.2=1
2.8 + 1.5 + 0.7=5
3.12- 5.6 + 2.9=0.42
4.8- 5.4 + 1.4 =0.8
5.6- 3.8 – 0.38 = 1.42
6.4 + 5.9 + 3.7 = 16
7.5 - 3.2 + 4.5 = 8.8
8.7 + 1.8 + 1.9 = 12.4
9.9 - 5.6 + 5.6 =9.9
10.3 - 8.9 - 1.3= 0.1
11.7 + 5.49 + 3.14= 20.33
12.6 +1.2 + 2.3 = 16.1
13.8 - 4.5 + 11.5 =20.8
14.3 - 5.6 – 5.6 =3.1
15.9 - 2.7 – 10.21 = 2.99
16.5 - 1.8 – 1.4= 13.3
17.4 + 2.5 + 2.3= 22.2
18.4 + 8.7 – 5.6 =21.5
19.1+3.2 – 3.4 = 18.9
20.3 - 2.9 + 1.3= 18.7
21.5 - 2.5 + 3.7= 22.7
22.3 + 2.3 + 1.6= 26.2
23.1 + 2.3 + 5.6= 31
24.9 + 11 - 1.2= 34.7
25.5 - 11.5 + 4.3= 18.3
26.4 - 2.3 + 1.3 = 25.4
27.7 + 1.19 - 5.6= 23.29
28.1 + 3.4 - 2.3= 29.2
29.8 -2.16 + 1.2= 28.841.2＋9＝10.2
5.43－3.06＝2.37
3＋1.2＝4.2
0.12＋5＝5.12
1.2＋1.8＋1.4＝4.4
6.2＋16＋3.8＝26
14－0.6＝13.4
20.3－8＝12.3
50－1.5＋4＝ 53.5
175－0.56＝174.44
2.08＋11＝13.089
0.4＋20＝ 20.4
2.5＋67＋7.5＝77
4.5－3＝1.5
25－0.38＝1.62
5.4＋9.6＝15
5.6－4＝1.6
1.45＋55＝56.45
4.6＋49＋51＝104.6
9.1－7＝2.1
10.3－0.3＝ 10
28＋9.2＝37.2
43.6＋2.08＝45.68
14－7.4＝6.6
0.65＋4.35＝ 5
10－5.4＝4.6
1.5－0.06＝1.44
0.36＋1.54＝2
14－7.4＝6.6
0.65＋4.35＝ 5
10－5.4＝4.6
1.5－0.06＝1.44
0.36＋1.54＝2
0.75＋0.25=1
1.37+1+7.63=10
5.6+2.7+4.4=12.7
9.14-1.43-4.57=3.14
77+2.7+2.3+25=107
1.88+2.3+3.7=7.88
9.14-1.43-4.57=3.14
77+2.7+2.3+25=107
1.88+2.3+3.7=7.88
0.34+0.45=0.79
0.57+0.9=1.47
8-4.6=3.4
0.6-0.37=0.23
4.9+9.8=14.7
39.5+98.8=138.3
1.4+2.8=4.2
1.5+3=4.5
1.6+3.2=4.8
1.7+3.4=5.1
1.8+3.6=5.4
1.9+3.8=5.7
0.2+0.40=0.6
2.1+4.2=6.3
2.2+4.4=6.6
2.3+4.6=6.9
2.4+4.8=7.2
2.5+5=7.5
2.6+5.2=7.8
2.7+5.4=8.1
2.8+5.6=8.4
2.9+5.8=8.7
0.3+0.6=0.9
3.1+6.2=9.3
3.2+6.4=9.6
3.3+6.6=9.9
1-0.3=0.7
1.5-0.4=1.1
2-0.5=1.5
2.5-0.6=1.9
3.0-0.7=2.3
3.5-0.8=2.7
4-0.9=3.1
4.5-1=3.5
5-1.1=3.9
5.5-1.2=4.3
6-1.3=4.7
6.5-1.4=5.1
7-1.5=5.5
7.5-1.6=5.9
8-1.7=6.3
8.5-1.8=6.7
9-1.9=7.1
9.5-2=7.5
10-2.1=7.9
10.5-2.2=8.3
11-2.3=8.7
11.5-2.4=9.1
12-2.5=9.5
12.5-2.6=9.9
13-2.7=10.3
0.2+0.6+0.0.2=1
2.8 + 1.5 + 0.7=5
3.12- 5.6 + 2.9=0.42
4.8- 5.4 + 1.4 =0.8
5.6- 3.8 – 0.38 = 1.42
6.4 + 5.9 + 3.7 = 16
7.5 - 3.2 + 4.5 = 8.8
8.7 + 1.8 + 1.9 = 12.4
9.9 - 5.6 + 5.6 =9.9
10.3 - 8.9 - 1.3= 0.1
11.7 + 5.49 + 3.14= 20.33
12.6 +1.2 + 2.3 = 16.1
13.8 - 4.5 + 11.5 =20.8
14.3 - 5.6 – 5.6 =3.1
15.9 - 2.7 – 10.21 = 2.99
16.5 - 1.8 – 1.4= 13.3
17.4 + 2.5 + 2.3= 22.2
18.4 + 8.7 – 5.6 =21.5
19.1+3.2 – 3.4 = 18.9
20.3 - 2.9 + 1.3= 18.7
21.5 - 2.5 + 3.7= 22.7
22.3 + 2.3 + 1.6= 26.2
23.1 + 2.3 + 5.6= 31
24.9 + 11 - 1.2= 34.7
25.5 - 11.5 + 4.3= 18.3
26.4 - 2.3 + 1.3 = 25.4
27.7 + 1.19 - 5.6= 23.29
28.1 + 3.4 - 2.3= 29.2
29.8 -2.16 + 1.2= 28.84
30.1 + 1.5 – 1.5 =30.1
累死了，记得加分！！！！
318

收起