问题 解答题
脱式计算(能简算的要简算).
49×
5
46
1
6
+
3
4
×
2
3
÷2       
4
5
÷
7
11
-80%×
4
7

2-
6
13
÷
9
26
-
2
3
3
7
+
1
17
)×42-
8
17
1
3
-
1
4
)÷
1
2
+
5
6
答案

(1)49×

5
46

=(46+3)×

5
46

=46×

5
46
+3×
5
46

=5+

15
46

=5

15
46

(2)

1
6
+
3
4
×
2
3
÷2,

=

1
6
+
3
4
×
2
3
×
1
2

=

1
6
+
1
4

=

2
12
+
3
12

=

5
12

(3)

4
5
÷
7
11
-80%×
4
7

=

4
5
×
11
7
-
4
5
×
4
7

=(

11
7
-
4
7
)×
4
5

=1×

4
5

=

4
5

(4)2-

6
13
÷
9
26
-
2
3

=2-

6
13
×
26
9
-
2
3

=2-

4
3
-
2
3

=2-(

4
3
+
2
3
),

=2-2,

=0;

(5)(

3
7
+
1
17
)×42-
8
17

=(

3
7
×42+
1
17
×42-
8
17

=18+

42
17
-
8
17

=18+(

42
17
-
8
17
),

=18+2,

=20;

(6)(

1
3
-
1
4
)÷
1
2
+
5
6

=(

4
12
-
3
12
)÷
1
2
+
5
6

=

1
12
×2+
5
6

=

1
6
+
5
6

=1.

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