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

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( 4 5 + 1 4 )÷ 7 3 + 7 10 10÷[ 8 3 -( 5 13 ÷ 5 26 + 2 5 )].

(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÷[
8
3
-(2+
2
5
)],
=10÷[
8
3
-
12
5
],
=10÷[
40
15
-
36
15
],
=10÷
4
15

=10×
15
4

=
75
2

=37
1
2
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