题目内容
计算:
(1)(a+b)(a-b)+(a+b)2-2(a-b)2
(2)(2x3)3-7x5-(-x2)2-(-
x2)3÷(-x3)
(1)(a+b)(a-b)+(a+b)2-2(a-b)2
(2)(2x3)3-7x5-(-x2)2-(-
| 2 |
| 3 |
(1)(a+b)(a-b)+(a+b)2-2(a-b)2,
=a2-b2+a2+2ab+b2-2a2+4ab-2b2,
=6ab-2b2;
(2)(2x3)3-7x5•(-x2)2-(-
x2)3÷(-x3),
=8x9-7x5•x4+
x6÷(-x3),
=8x9-7x9-
x3,
=x9-
x3.
=a2-b2+a2+2ab+b2-2a2+4ab-2b2,
=6ab-2b2;
(2)(2x3)3-7x5•(-x2)2-(-
| 2 |
| 3 |
=8x9-7x5•x4+
| 8 |
| 27 |
=8x9-7x9-
| 8 |
| 27 |
=x9-
| 8 |
| 27 |
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