脱式计算.(能简算的要简算) 0.125×0.25×8×4 [5-1.7÷(2-1)]×1 87×386 49÷(79+49)×114

2024-11-08 22:57:58
推荐回答(1个)
回答1:

(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