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8.9÷10=7-0.7=0.25×39×0.4=
8.2+0.18=4.5×8=87-________+83.7=86.

84.7
分析:根据小数加法、减法、乘法、除法的计算法则,直接进行口算即可,其中0.25×39×0.4,运用乘法交换律和结合律进行简算.
解答:8.9÷10=0.89;7-0.7=6.3;0.25×39×0.4=3.9;8.2+0.18=8.38;4.5×8=36;87-84.7+83.7=86.故答案为:0.89;6.3;3.9;8.38;36;84.7.
点评:此题考查的目的是使学生牢固掌握小数的加法、减法、乘法、除法的计算法则,并且能够正确迅速地进行口算,注意运算定律的灵活运用.
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