问题 解答题
计算题:
(1)
12
+2
75
-3
27

(2)
12
-
3
3
-(
2
+1)(
2
-1)

(3)
2
3
9x
+6
x
4
-2
1
x
答案

(1)

12
+2
75
-3
27

=2

3
+10
3
-9
3

=(2+10-9)

3

=3

3

(2)

12
-
3
3
-(
2
+1)(
2
-1),

=2-1-(2-1),

=1-1,

=0;

(3)

2
3
9x
+6
x
4
-2
1
x

=2

x
+3
x
-
2
x
x

=

(5x-2)
x
x

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