问题 解答题

计算下面各题.

12.4×3.5×2

2.17×0.86-0.42

4.3+0.05×2.7

9.04--8.5×0.66

(4.93-0.93)×1.75

9.3×(6.2+3.8)

答案

(1)12.4×3.5×2

=12.4×(3.5×2)

=12.4×7

=86.8;

(2)2.17×0.86-0.42

=1.8662-0.42

=1.4462;

(3)4.3+0.05×2.7

=4.3+0.135

=4.435;

(4)9.04-8.5×0.66

=9.04-5.61

=3.43;

(5)(4.93-0.93)×1.75

=4×1.75

=7;

(6)9.3×(6.2+3.8)

=9.3×10

=93.

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