(1)(-3)2-(3.14-π)0+(-12)3(2)(-2ab)(3a2-2ab-b2)(3) (2x-5)(2x+5)-(2x+1)(2x-3)(4)(x

(1)(-3)2-(3.14-π)0+(-12)3(2)(-2ab)(3a2-2ab-b2)(3) (2x-5)(2x+5)-(2x+1)(2x-3)(4)(x

题型:解答题难度:一般来源:不详
(1)(-3)2-(3.14-π)0+(-123
(2)(-2ab)(3a2-2ab-b2
(3) (2x-5)(2x+5)-(2x+1)(2x-3)
(4)(
x
3
+3)2-(
x
3
-3)2

(5)(x+1)(x+3)-(x-2)2
(6)(a+b+3)(a+b-3)
(7)(9x2y-6xy2+3xy)÷( 3xy)
答案
(1)(-3)2-(3.14-π)0+(-123=9-1+(-1)3=9-1-1=7;
(2)(-2ab)(3a2-2ab-b2)=-6a3b+4a2b2-+2ab3
(3) (2x-5)(2x+5)-(2x+1)(2x-3)=4x2-25-4x2+4x+3=4x-22;
(4)(
x
3
+3)2-(
x
3
-3)2
=(
x
3
+3+
x
3
-3)(
x
3
+3-
x
3
+3)=12×
x
3
=4x;
(5)(x+1)(x+3)-(x-2)2=x2+4x+3-x2+4x-4=8x-1;
(6)(a+b+3)(a+b-3)=(a+b)2-9=a2+2ab+b2-9;
(7)(9x2y-6xy2+3xy)÷( 3xy)=3x-2y+1.
故答案为7、-6a3b+4a2b2-+2ab3、4x-22、4x、8x-1、a2+2ab+b2-9、3x-2y+1.
举一反三
如果(x-2)0有意义,那么x的取值范围是(  )
A.x>2B.x<2C.x=2D.x≠2
题型:单选题难度:简单| 查看答案
(1)计算:2sin30°+2


3
tan60°-2-1

(2)解方程:
1
2
x2+
1
2
x=0
题型:解答题难度:一般| 查看答案
计算:-14+(
1
2
)
-2
+


12
+(1-


2
)
0
-2tan60°.
题型:解答题难度:一般| 查看答案
解方程或计算
(1)计算:-22+


8
sin45°-2-1+(3.14-π)0

(2)解方程:x2-4x-5=0.
题型:解答题难度:一般| 查看答案
求值:(-2)0=______.
题型:填空题难度:一般| 查看答案
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