问题 解答题
(1)(-3
3
4
)-3-(2
1
2
)-1+(-
1
2
)2

(2)[(0.1)-2+(0.01)-1(-
1
10
)-3

(3)(3x-2-1÷(
1
2
x)-2
(
3y-1
2x
)2

(4)(a-2-b-2)÷(a-1-b-1
(5)x-2y-2÷(x-2-y-2
(6)(2x-2+y)2-(2x-2-y)2
答案

(1)(-3

3
4
)-3-(2
1
2
)-1+(-
1
2
)2

=-

64
3375
+
2
5
+
1
4

=

8519
13500

(2)[(0.1)-2+(0.01)-1(-

1
10
)-3

=[100+100]×(-1000)

=200×(-1000)

=-200000;

(3)(3x-2-1÷(

1
2
x)-2(
3y-1
2x
)2

=

x2
3
x2
4
9
4x2y2

=

3x2
16y2

(4)(a-2-b-2)÷(a-1-b-1

=(

1
a2
-
1
b2
)÷(
1
a
-
1
b

=

(b+a)(b-a)
a2b2
ab
b-a

=

a+b
ab

(5)x-2y-2÷(x-2-y-2

=

1
x2y2
÷(
1
x2
-
1
y2

=

1
x2y2
÷
y2-x2
x2y2

=

1
(y+x)(y-x)

(6)(2x-2+y)2-(2x-2-y)2

=4x-4+2x-2y+y2-(4x-4-2x-2y+y2

=4x-4+2x-2y+y2-4x-4+2x-2y-y2

=4x-2y.

单项选择题
单项选择题