问题 解答题
递等式计算.(能简算的要简算,并写出主要的简算过程)
①1.8+3.84÷(15-12.6)

8×(
1
18
+
5
8
)
5
8
÷[5×(
5
6
-
3
4
)]
④0.4×80×2.5×0.125.
答案

①1.8+3.84÷(15-12.6),

=1.8+3.84÷2.4,

=1.8+1.6,

=3.4;

8×(

1
18
+
5
8
),

=8×

1
18
+8×
5
8

=

4
9
+5,

=5

4
9

5
8
÷[5×(
5
6
-
3
4
)],

=

5
8
÷[5×
1
12
],

=

5
8
÷
5
12

=

3
2

④0.4×80×2.5×0.125,

=(0.4×2.5)×(80×0.125),

=1×10,

=10.

实验题
问答题 简答题