问题 解答题
下列各题,能简算的必须简算.
46×
44
45
4
5
-(
2
7
-
1
5
)÷
1
4
90×
4
91
5
36
÷[(
1
2
-
1
6
)×
5
9
]
8
17
÷23+
1
23
×
9
17
3
4
×
2
5
+
3
4
×0.6.
答案

(1)46×

44
45

=(45+1)×

44
45

=45×

44
45
+1×
44
45

=44+

44
45

=44

44
45

(2)

4
5
-(
2
7
-
1
5
)÷
1
4

=

4
5
-
3
35
÷
1
4

=

4
5
-
12
35

=

16
35

(3)90×

4
91

=(91-1)×

4
91

=91×

4
91
-1×
4
91

=4-

4
91

=3

87
91

(4)

5
36
÷[(
1
2
-
1
6
)×
5
9
],

=

5
36
÷[
1
3
×
5
9
],

=

5
36
÷
5
27

=

3
4

(5)

8
17
÷23+
1
23
×
9
17

=

8
17
×
1
23
+
1
23
×
9
17

=(

8
17
+
9
17
)×
1
23

=1×

1
23

=

1
23

(6)

3
4
×
2
5
+
3
4
×0.6,

=

3
4
×(
2
5
+0.6),

=

3
4
×1,

=

3
4

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