问题 解答题

用递等式计算下面各题.

(1)9.6×4.5+1.5

(2)0.9-0.25×0.18

(3)(1.25+18.5)×0.63

(4)0.75×16×5.2

(5)0.15×(9.3-3.9)

(6)0.63×1.6×20.

答案

(1)9.6×4.5+1.5,

=43.2+1.5,

=44.7;

(2)0.9-0.25×0.18,

=0.9-0.045,

=0.855;

(3)(1.25+18.5)×0.63,

=19.75×0.63,

=12.4425;

(4)0.75×16×5.2,

=12×5.2,

=62.4;

(5)0.15×(9.3-3.9),

=0.15×5.4,

=0.81;

(6)0.63×1.6×20,

=1.008×20,

=20.16.

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