1+3= 3-2= 7-5= 10+30=
30-20= 70-50= 8-4= 3+7=
10-8= 80-40= 30+70= 100-80=
分析:本題根據(jù)整數(shù)加法、減法的運(yùn)算法則計(jì)算即可.
解答:解:
1+3=4 3-2=1 7-5=2 10+30=40
30-20=10 70-50=20 8-4=4 3+7=10
10-8=2 80-40=40 30+70=100 100-80=20
點(diǎn)評(píng):本題中的數(shù)據(jù)較為簡單,在保證做題質(zhì)量的同時(shí),要注意提高做題的速度.
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