能用简便方法计算的用简便方法计算.25×1.25×32(3.75+4.1+2.15)×9.85400-2940÷28×27(20.2×0.4+7.88)÷4.2(45+14)÷73+71010÷[83-(513÷526+25)].-数学

题文

能用简便方法计算的用简便方法计算.
25×1.25×32
(3.75+4.1+2.15)×9.8
5400-2940÷28×27
(20.2×0.4+7.88)÷4.2
4
5
+
1
4
)÷
7
3
+
7
10

10÷[
8
3
-(
5
13
÷
5
26
+
2
5
)].
题型:解答题  难度:中档

答案

(1)25×1.25×32,
=(25×4)×(1.25×8),
=100×10,
=1000;

(2)(3.75+4.1+2.15)×9.8,
=10×9.8,
=98;

(3)5400-2940÷28×27,
=5400-105×27,
=5400-2835,
=2565;

(4)(20.2×0.4+7.88)÷4.2,
=(8.08+7.88)÷4.2,
=15.96÷4.2,
=3.8;

(5)(
4
5
+
1
4
)÷
7
3
+
7
10

=
21
20
×
3
7
+
7
10

=
9
20
+
14
20

=
23
20

=1
3
20


(6)10÷[
8
3
-(
5
13
÷
5
26
+
2
5
)],
=10÷[
8
3
-(
5
13
×
26
5
+
2
5
)],
=10÷[
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