题目内容

计算下面各题,能简算的要简算.
(1.5+0.7)×(0.09÷1.8)
8
15
÷9+
1
9
×
7
15

71.2-2.3×1.6-6.32
1
9
÷[
4
7
×(
2
3
+
1
4
)]
(1)(1.5+0.7)×(0.09÷1.8)
=2.2×0.05,
=0.11;

(2)
8
15
÷9+
1
9
×
7
15

=
8
15
×
1
9
+
1
9
×
7
15

=(
8
15
+
7
15
)×
1
9

=1×
1
9

=
1
9


(3)71.2-2.3×1.6-6.32
=71.2-3.68-6.32,
=71.2-(3.68+6.32),
=71.2-10,
=61.2;

(4)
1
9
÷[
4
7
×(
2
3
+
1
4
)]

=
1
9
÷[
4
7
×
11
12
],
=
1
9
÷
11
21

=
7
33
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