试题:
(1)
12
×
3
-
98
2

(2)
30.125
+
3
1
16
-
3
3
8

(3)(
2
+
3
)(
2
-
3
)

(4)
1
2
8x
-(6x
x
18
+2
x
2
-3x2
2
x
)

答案:

我来补答
(1)原式=2
3
×
3
-
7
2
2

=6-7
=-1;
(2)原式=0.5+
7
4
-
3
6
4

=
9
4
-
3
6
4

(3)原式=(
2
2-(
3
2
=2-3=-1;
(4)原式=
1
2
×2
2x
-(6x×
2x
6
+2×
2x
2
-3x2×
2x
x

=
2x
-(x
2x
+
2x
-3x
2x

=2x
2x
 
 
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