题目内容
(1)(-3)2-(3.14-π)0+(-12)3
(2)(-2ab)(3a2-2ab-b2)
(3) (2x-5)(2x+5)-(2x+1)(2x-3)
(4)(
+3)2-(
-3)2
(5)(x+1)(x+3)-(x-2)2
(6)(a+b+3)(a+b-3)
(7)(9x2y-6xy2+3xy)÷( 3xy)
(2)(-2ab)(3a2-2ab-b2)
(3) (2x-5)(2x+5)-(2x+1)(2x-3)
(4)(
| x |
| 3 |
| x |
| 3 |
(5)(x+1)(x+3)-(x-2)2
(6)(a+b+3)(a+b-3)
(7)(9x2y-6xy2+3xy)÷( 3xy)
(1)(-3)2-(3.14-π)0+(-12)3=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)(
+3)2-(
-3)2=(
+3+
-3)(
+3-
+3)=12×
=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.
(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 |
| x |
| 3 |
| x |
| 3 |
| x |
| 3 |
| x |
| 3 |
| x |
| 3 |
| x |
| 3 |
(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.
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