问题 解答题
计算,能用简便方法的用简便方法.
101×5.80.25×12.8×0.4
0.27×7.2+0.27×2.82.35×0.15-0.15×0.35.
答案

(1)101×5.8,

=(100+1)×5.8,

=100×5.8+5.8,

=580+5.8,

=585.8;

(2)0.25×12.8×0.4,

=0.25×0.4×12.8,

=0.1×12.8,

=1.28;

(3)0.27×7.2+0.27×2.8,

=0.27×(7.2+2.8),

=0.27×10,

=2.7;

(4)2.35×0.15-0.15×0.35,

=0.15×(2.35-0.35),

=0.15×2,

=0.3.

问答题
单项选择题