问题 解答题
简便计算.
5
8
+
1
3
+
3
8
+
2
3
+8
4×0.8×2.5×1.25117×12+83×12.
答案

(1)

5
8
+
1
3
+
3
8
+
2
3
+8,

=(

5
8
+
3
8
)+(
1
3
+
2
3
)+8,

=1+1+8,

=10;

(2)4×0.8×2.5×1.25,

=(4×2.5)×(0.8×1.25),

=10×1,

=10;

(3)117×12+83×12,

=(117+83)×12,

=200×12,

=2400.

单项选择题 A1/A2型题
单项选择题