作业帮1.(a-b)(a+b)-(a+b)²+2b(b-a),化简2.设a-b=2,求a²+b²/2-ab的值3.计算.[(2x-y)(2x+y)+y(y-6x)]÷2x4.化简：(a+b)(a-b)+(a+b)²-2a²
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![1.(a-b)(a+b)-(a+b)²+2b(b-a),化简2.设a-b=2,求a²+b²/2-ab的值3.计算.[(2x-y)(2x+y)+y(y-6x)]÷2x4.化简：(a+b)(a-b)+(a+b)²-2a²](/uploads/image/z/1144264-40-4.jpg?t=1.%28a-b%29%28a%2Bb%29-%28a%2Bb%29%26sup2%3B%2B2b%28b-a%29%2C%E5%8C%96%E7%AE%802.%E8%AE%BEa-b%3D2%2C%E6%B1%82a%26sup2%3B%2Bb%26sup2%3B%2F2-ab%E7%9A%84%E5%80%BC3.%E8%AE%A1%E7%AE%97.%5B%282x-y%29%282x%2By%29%2By%28y-6x%29%5D%C3%B72x4.%E5%8C%96%E7%AE%80%EF%BC%9A%28a%2Bb%29%28a-b%29%2B%28a%2Bb%29%26sup2%3B-2a%26sup2%3B)
1.(a-b)(a+b)-(a+b)²+2b(b-a),化简2.设a-b=2,求a²+b²/2-ab的值3.计算.[(2x-y)(2x+y)+y(y-6x)]÷2x4.化简：(a+b)(a-b)+(a+b)²-2a²
1.(a-b)(a+b)-(a+b)²+2b(b-a),化简
2.设a-b=2,求a²+b²/2-ab的值
3.计算.[(2x-y)(2x+y)+y(y-6x)]÷2x
4.化简：(a+b)(a-b)+(a+b)²-2a²
1.(a-b)(a+b)-(a+b)²+2b(b-a),化简2.设a-b=2,求a²+b²/2-ab的值3.计算.[(2x-y)(2x+y)+y(y-6x)]÷2x4.化简：(a+b)(a-b)+(a+b)²-2a²
1、－4ab,
2、=(a-b)^2/2+a^2/2=2+a^2/2>=2.所以是大于等于2.
3、2x-3y
4、2ab
1. -4ab
2. 2+a²/2
3. 2x-3y
4. 2ab
a-b+(a+b)2+b2-a