问题 解答题
计算.(能简算的要简算)
1
2
+
3
4
)×(
1
2
-
1
3
7
5
×
1
11
+1.4÷
11
10
[
3
5
-(
3
4
-
2
3
)]÷4
3
4
+
5
12
)×12
(12×
5
6
-
17
4
)÷
1
4
7
12
×49+50×
5
12
答案

(1)(

1
2
+
3
4
)×(
1
2
-
1
3
),

=

5
4
×
1
6

=

5
24

(2)

7
5
×
1
11
+1.4÷
11
10

=

7
5
×
1
11
+
7
5
×
10
11

=(

1
11
+
10
11
)×
7
5

=1×

7
5

=

7
5

(3)[

3
5
-(
3
4
-
2
3
)]÷4,

=[

3
5
-
1
12
]÷4,

=

31
60
×
1
4

=

31
240

(4)(

3
4
+
5
12
)×12,

=

3
4
×12+
5
12
×12,

=9+5,

=14;

(5)(12×

5
6
-
17
4
)÷
1
4

=(10-

17
4
)×4,

=10×4-

17
4
×4,

=40-17,

=23;

(6)

7
12
×49+50×
5
12

=

7
12
×49+49×
5
12
+
5
12

=49×(

7
12
+
5
12
)+
5
12

=49×1+

5
12

=49+

5
12

=49

5
12

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