脱式计算:1.8-0.48÷1.6(58-14)×(89÷415)29÷[56×(45-23)](45+37)×79(712-38+23)÷124[(8.7-7.5)÷0.2]×0.15.-数学

14;

(3)(
4
5
+
3
7
)×
7
9

=
43
35
×
7
9

=
43
45


(4)
2
9
÷[
5
6
×(
4
5
-
2
3
)]
=
2
9
÷[
5
6
×
2
15
],
=
2
9
÷
1
9

=2;

(5)(
7
12
-
3
8
+
2
3
)÷
1
24

=(
5
24
+
2
3
)÷
1
24

=
21
24
÷
1
24

=21;

(6)[(8.7-7.5)÷0.2]×0.15
=[1.2÷0.2]×0.15,
=6×0.15,
=0.9.
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