1994.4×3.6+2006.9×6.4简算

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1994.4×3.6+2006.9×6.4简算
1994.4×3.6+2006.9×6.4简算

1994.4×3.6+2006.9×6.4简算
=1994.4X(3.6+6.4)+(2006.9-1994.4)X6.4
=1994.4X10+12.5X6.4
=19944+12.5X8X0.8
=19944+100X0.8
=19944+80
=20024

=1994.4*3.6+1994.4*6.4+12.5*6.4
=1994.4*10+12.5*6.4=19944+12.5*8*0.8=19944+100*0.8=19944+80=20024

(1995-0.6)*3.6+(2007-0.1)*6.4

=1994.4X3.6+(1994.4+12.5)X6.4
=1994.4X(3.6+6.4)+12.5X6.4
=1994.4X10+12.5X8X0.8
=19944+80
=20024

3.6×1994.4+2006.9×6.4要巧算 1994.4×3.6+2006.9×6.4简算简算3.6*1994 2/5+2006.9*6 2/5RT过程都要有的哈! 3.6x1994又五分之二,加2006.9乘六又五分之二. 8.6X-7.2+3.6=6.急, 3.6. 将-15.-12.-9.-6.-3.0.3.6.9填入9宫图中用-18.-15.-12.-9.-6.-3.0.3.6怎样拼成一个三阶幻方 6... 6. 6. 6. 6. 6. 6. 6. 6. 3.6+3.6*(3.6-3.6/3.6)/3.6如何简算