1.5-0.7= 0.37+0.63= 56×0.1=
5.1+3= 0.18+0.1= 280-285=
3×3.1= 5.6×2= 5×0.06=
分析:根據(jù)小數(shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算.
解答:解:
1.5-0.7=0.8, 0.37+0.63=1, 56×0.1=5.6,
5.1+3=8.1, 0.18+0.1=0.28, 280-285=-5,
3×3.1=9.3, 5.6×2=11.2, 5×0.06=0.3.
點(diǎn)評:口算時,注意運(yùn)算符號和數(shù)據(jù),然后再進(jìn)一步計(jì)算.
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