计算有理数的加减法:(请写出过程)谢 1.(-0.7)+(-0.4)+1+(-0.3)+0.5 2.(+15)+(-20)+(+28)=(-10)+(-5)+(-7)
3.(-3.2)+(-5/6)+(+41/5)=(-5/6)4.27/8+{(-27/12))+(+53/5)}+()-17/8)+22/5+(-31/12)...
3.(-3.2)+(-5/6)+(+41/5)=(-5/6)4.27/8+{(-27/12))+(+53/5)}+()-17/8)+22/5+(-31/12)
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2013-08-26
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(-0.7)+(-0.4)+1+(-0.3)+0.5
=-0.7-0.4+1+1-0.3+0.5
=-1.1+2-0.3+0.5
=0.9-0.3+0.5
=0.6+0.5
=1.1
=-0.7-0.4+1+1-0.3+0.5
=-1.1+2-0.3+0.5
=0.9-0.3+0.5
=0.6+0.5
=1.1
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