问题 解答题
脱式计算.(能简算的要简算)
0.125×0.25×8×4[5-1.7÷(2-1)]×187×
3
86
4
9
÷(
7
9
+
4
9
)×
11
4
3.9÷1.5-2.3×0.51
1
2
÷
3
4
-
5
8
×
16
35
答案

(1)0.125×0.25×8×4,

=(0.125×8)×(0.25×4),

=1×1,

=1;

(2)[5-1.7÷(2-1)]×1,

=[5-1.7÷1]×1,

=[5-1.7]×1,

=3.3×1,

=3.3;

(3)87×

3
86

=(86+1)×

3
86

=86×

3
86
+1×
3
86

=3+

3
86

=3

3
86

(4)

4
9
÷(
7
9
+
4
9
)×
11
4

=

4
9
÷
11
9
×
11
4

=

4
11
×
11
4

=1;

(5)3.9÷1.5-2.3×0.5,

=2.6-1.15,

=1.45;

(6)1

1
2
÷
3
4
-
5
8
×
16
35

=2-

2
7

=1

5
7

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