题目内容

用简便方法计算,要求写出简算的主要过程.
3
4
-
2
3
)×12÷0.1
3
8
×[
8
9
÷(
5
6
+
3
4
)]
5.58-
3
8
+5.42-
5
8

7
16
×40-
5
16
÷
1
40
(1)(
3
4
-
2
3
)×12÷0.1,
=(
3
4
×12-
2
3
×12)÷0.1,
=(9-8)÷0.1,
=1÷0.1,
=10;

(2)
3
8
×[
8
9
÷(
5
6
+
3
4
)],
=
3
8
×[
8
9
÷
19
12
],
=
3
8
×
8
9
×
12
19

=
4
19


(3)5.58-
3
8
+5.42-
5
8

=(5.58+5.42)-(
3
8
+
5
8
),
=10-1,
=9;

(4)
7
16
×40-
5
16
÷
1
40

=
7
16
×40-
5
16
×40,
=(
7
16
-
5
16
)×40,
=
1
8
×40,
=5.
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