题目内容

计算,怎样简便怎样算
7
12
×
3
8
+
7
12
×
5
8
5
7
×
3
4
×
2
5
(
5
11
-
1
8
)×88
58×
3
7
+12÷2
1
3
67×
31
33
1
4
÷(3-
8
11
-
3
11
)
(1)
7
12
×
3
8
+
7
12
×
5
8
,
=
7
12
×(
3
8
+
5
8
),
=
7
12
×1,
=
7
12
;

(2)
5
7
×
3
4
×
2
5
=
3
14
;

(3)(
5
11
-
1
8
)×88,
=
5
11
×88-
1
8
×88,
=40-11,
=29;

(4)58×
3
7
+12÷2
1
3
,
=58×
3
7
+12×
3
7
,
=(58+12)×
3
7
,
=70×
3
7
,
=30;

(5)67×
31
33
,
=(66+1)×
31
33
,
=62+
31
33
,
=62
31
33
;

(6)
1
4
÷(3-
8
11
-
3
11
)
=
1
4
÷[3-(
8
11
+
3
11
)],
=
1
4
÷[3-1],
=
1
4
÷2,
=
1
8
.
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