题目内容

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.

(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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