0.7+0.3= 0.52+0.48= 0.5×5= 7÷100=
1.8-0.4= 1-0.65= 0.04×1000= 0.07÷2=
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：
0.7+0.3=1 0.52+0.48=1 0.5×5=2.5 7÷100=0.07
1.8-0.4=1.4 1-0.65=0.35 0.04×1000=40 0.07÷2=0.035．
點(diǎn)評：口算時(shí)，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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