题目内容

能简算的要简算
4
7
×
5
12
+
5
12
×
3
7
2
3
-
4
9
)×
3
2
9
4
×99+
9
4
2
5
×
17
16
-
1
16
×
2
5
121×
7
120
119×
7
120
(1)
4
7
×
5
12
+
5
12
×
3
7

=(
4
7
+
3
7
)×
5
12

=1×
5
12

=
5
12


(2)(
2
3
-
4
9
)×
3
2

=
2
3
×
3
2
-
4
9
×
3
2

=1-
2
3

=
1
3


(3)
9
4
×99+
9
4

=
9
4
×(99+1)
=
9
4
×100
=225;

(4)
2
5
×
17
16
-
1
16
×
2
5

=
2
5
×(
17
16
-
1
16

=
2
5
×1
=
2
5


(5)121×
7
120

=(120+1)×
7
120

=120×
7
120
+1×
7
120

=7+
7
120

=7
7
120


(6)119×
7
120

=(120-1)×
7
120

=120×
7
120
-
7
120

=7-
7
120

=6
113
120
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