问题 解答题
简便运算要注意,写出简算过程,否则不会得分的.
376+199  
575-298  25×36  21×8×5 25×32×125.
答案

①376+199,

=376+200-1,

=575;

②575-298,

=575-300+2,

=277;

③25×36,

=25×4×9,

=100×9,

=900;

④21×8×5,

=21×(8×5),

=21×40,

=840;

⑤25×32×125,

=(25×4)×(8×125),

=100×1000,

=100000.

单项选择题
单项选择题