计算 (-13)+(+12)+(-7)+(+38)= 1/3-1/2-3/4+2/3= (-7.4)+2.6+(-0.6)+(-0.5)+5.9=(-0.5)+2又1/4+2.75+(-5又1/2)= 急 写过程和结果

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计算 (-13)+(+12)+(-7)+(+38)= 1/3-1/2-3/4+2/3= (-7.4)+2.6+(-0.6)+(-0.5)+5.9=(-0.5)+2又1/4+2.75+(-5又1/2)= 急 写过程和结果
计算 (-13)+(+12)+(-7)+(+38)= 1/3-1/2-3/4+2/3= (-7.4)+2.6+(-0.6)+(-0.5)+5.9=
(-0.5)+2又1/4+2.75+(-5又1/2)=
急 写过程和结果

计算 (-13)+(+12)+(-7)+(+38)= 1/3-1/2-3/4+2/3= (-7.4)+2.6+(-0.6)+(-0.5)+5.9=(-0.5)+2又1/4+2.75+(-5又1/2)= 急 写过程和结果
(-13)+(+12)+(-7)+(+38)
=-13+12-7+38
=-1-7+38
=-8+38
=30
1/3-1/2-3/4+2/3
=(1/3+2/3)-(1/2+3/4)
=1-5/4
=-1/4
(-7.4)+2.6+(-0.6)+(-0.5)+5.9
=-7.4+2.6-0.6-0.5+5.9
=(2.6-0.6)+5.9-(7.4+0.5)
=2+5.9-7.9
=7.9-7.9
=0