问题 解答题

脱式计算,能简算的要简便.

0.25×9.87×4

0.73×101

97.8×9.9+97.8

76.3×27-76.3×17.

答案

(1)0.25×9.87×4

=0.25×4×9.87,

=1×9.87,

=9.87;

(2)0.73×101

=0.73×(100+1),

=0.73×100+0.73×1,

=73+0.73,

=73.73;

(3)97.8×9.9+97.8

=97.8×9.9+97.8×1,

=97.8×(9.9+1),

=97.8×10.9,

=1066.02;

(4)76.3×27-76.3×17

=76.3×(27-17),

=76.3×10,

=763.

单项选择题
单项选择题