能用简便方法计算的要简算.32×125%×0.25 12.5-0.625一 3 8 4 9 ×[

2024-11-21 20:57:53
推荐回答(1个)
回答(1):


(1)32×125%×0.25,
=(4×8)×1.25×0.25,
=(8×1.25)×(4×0.25),
=10×1,
=10;

(2)12.5-0.625-
3
8

=12.5-(0.625+
3
8
),
=12.5-1,
=11.5;

(3)
4
9
×[
3
4
-(
7
16
-
1
4
)],
=
4
9
×[
3
4
-
7
16
+
1
4
],
=
4
9
×[
3
4
+
1
4
-
7
16
],
=
4
9
×[1-
7
16
],
=
4
9
×
9
16

=
1
4


(4)1÷[(
1
3
+
5
6
)÷
5
12
],
=1÷[
7
6
÷
5
12
],
=1÷
14
5

=
5
14