问题 解答题
用简便方法计算.
1.25×880.91×99+0.91
4
5
×7.7+2.3÷
5
4
答案

(1)1.25×88,

=1.25×8×11,

=10×11,

=110;

(2)0.91×99+0.91,

=0.91×(99+1),

=0.91×100,

=91;

(3)

4
5
×7.7+2.3÷
5
4

=

4
5
×7.7+2.3×
4
5

=

4
5
×(7.7+2.3),

=

4
5
×10,

=8.

单项选择题
单项选择题