题目内容

脱式计算.
7
12
×
8
21
×3        
4
25
÷
5
12
8
9
×
9
7
÷
4
7
3
4
+
2
3
)÷
7
12
4
5
-
2
3
)×250%      
7
8
-(
1
2
-
1
4
)÷
7
16
(1)
7
12
×
8
21
×3,
=
2
9
×
3,
=
2
3


(2)2÷
4
25
÷
5
12

=2÷(
4
25
×
5
12
),
=2÷
1
15

=30;

(3)
8
9
×
9
7
÷
4
7

=
8
7
÷
4
7

=2;

(4)(
3
4
+
2
3
)÷
7
12

=(
3
4
+
2
3
)×
12
7

=
3
4
×
12
7
+
2
3
×
12
7

=
9
7
+
8
7

=2
3
7


(5)(
4
5
-
2
3
)×250%,
=
2
15
×
250%,
=
1
3


(6)
7
8
-(
1
2
-
1
4
)÷
7
16

=
7
8
-
1
4
÷
7
16

=
7
8
-
4
7

=
17
56
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