问题 解答题
用简便方法计算
25×99+2575×75+75×2564×125
17+64+83+361200-128-723000÷125÷8.
答案

(1)25×99+25,

=25×(99+1),

=25×100,

=2500;

(2)75×75+75×25,

=75×(75+25),

=75×100,

=7500;

(3)64×125,

=8×8×125,

=8×(8×125),

=8×1000,

=8000;

(4)17+64+83+36,

=(17+83)+(64+36),

=100+100,

=200;

(5)1200-128-72,

=1200-(128+72),

=1200-200,

=1000;

(6)3000÷125÷8,

=3000÷(125×8),

=3000÷1000,

=3.

单项选择题
单项选择题