问题 解答题
计算下面各题(能简算的要简算)
(1)
7
25
×101-
7
25

(2)2.5×2.72+0.24×2.5+1.04×2.5
(3)200-120÷1.6×1.2.
答案

(1)

7
25
×101-
7
25

=

7
25
×(101-1),

=

7
25
×100,

=28;

(2)2.5×2.72+0.24×2.5+1.04×2.5,

=2.5×(2.72+0.24+1.04),

=2.5×4,

=10;

(3)200-120÷1.6×1.2,

=200-(120÷4)×(1.2÷0.4),

=200-30×3,

=200-90,

=110.

解答题
单项选择题 A1/A2型题