题目内容

计算下面各题,能简算的要简算.
19
12
-
3
7
)-(
4
7
+
7
12

5
16
×[8.6÷(3.7+
3
5
)]
3
4
×
1
8
+
3
4
×
7
8
)÷
1
3

2×(0.25+
3
4
)÷
2
3
-
2
5
(1)(
19
12
-
3
7
)-(
4
7
+
7
12
),
=
19
12
-
3
7
-
4
7
-
7
12

=
19
12
-
7
12
-
3
7
-
4
7

=(
19
12
-
7
12
)-(
3
7
+
4
7
),
=1-1,
=0;

(2)
5
16
×[8.6÷(3.7+
3
5
)],
=
5
16
×[8.6÷4.3],
=
5
16
×2,
=
5
8


(3)(
3
4
×
1
8
+
3
4
×
7
8
)÷
1
3

=[
3
4
×(
1
8
+
7
8
)]÷
1
3

=[
3
4
×1]÷
1
3

=
3
4
×3,
=
9
4



(4)2×(0.25+
3
4
)÷
2
3
-
2
5

=2×1÷
2
3
-
2
5

=2÷
2
3
-
2
5

=3-
2
5

=2
3
5
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