题目内容

【题目】计算下面各题,能简算的要简算。

0.8÷5÷0.4 3.2÷(3.2×5) 3.2×5.8-3.2×1.8

7.05÷4.7×(1.2+4.5)

【答案】0.4;0.2;12.8

8.55;229.45

0.15;89.6

【解析】

0.8÷5÷0.4 3.2÷(3.2×5) 3.2×5.8-3.2×1.8

=0.8÷(5×0.4) =3.2÷3.2÷5 =3.2×(5.8-1.8)

=0.8÷2 =1÷5 =3.2×4

=0.4 =0.2 =12.8

7.05÷4.7×(1.2+4.5)

=7.05÷4.7×5.7 =

=1.5×5.7 =35.3×6.5

=8.55 =229.45

=16×5.6

=7.5÷50 =89.6

=0.15

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