问题 解答题
简便计算
17×(
3
17
+
7
18
)×18-40
1.25×3.2×0.25
7
7
8
-(3.875-2.64)
答案

(1)17×(

3
17
+
7
18
)×18-40,

=17×

3
17
×18+17×
7
18
×18-40

=54+119-40,

=173-40,

=133;

(2)1.25×3.2×0.25,

=(1.25×0.8)×(4×0.25),

=1×1,

=1;

(3)7

7
8
-(3.875-2.64),

=7.875-3.875+2.64,

=4+2.64,

=6.64;

单项选择题
单项选择题