题目内容
计算:
①(x2)3÷(x-x2);
②(-
)-1+(-3)2×40-(-
)-3;
③(x+3)2-(x-1)(x-2);
④(a-b-3)(a-b+3).
①(x2)3÷(x-x2);
②(-
| 1 |
| 3 |
| 1 |
| 2 |
③(x+3)2-(x-1)(x-2);
④(a-b-3)(a-b+3).
①原式=x6÷x3
=x3;
②原式=-3+9+8
=14;
③原式=x2+6x+9-(x2-2x-x+2)
=x2+6x+9-x2+2x+x-2
=9x+7;
④原式=(a-b)2-9
=a2-2ab+b2-9.
=x3;
②原式=-3+9+8
=14;
③原式=x2+6x+9-(x2-2x-x+2)
=x2+6x+9-x2+2x+x-2
=9x+7;
④原式=(a-b)2-9
=a2-2ab+b2-9.
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