把(x+y),(x-y),(a+b),(a-b)作为一个因式合并同类项1.3(x+y)^2-7(x-y)-9(x+y)^2-6(x-y)2.3(a-b)+6(a+b)-2(a+b)+6(a-b)注:^2表示x的2次方?
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![把(x+y),(x-y),(a+b),(a-b)作为一个因式合并同类项1.3(x+y)^2-7(x-y)-9(x+y)^2-6(x-y)2.3(a-b)+6(a+b)-2(a+b)+6(a-b)注:^2表示x的2次方?](/uploads/image/z/5246057-65-7.jpg?t=%E6%8A%8A%28x%2By%29%2C%28x-y%29%2C%28a%2Bb%29%2C%28a-b%29%E4%BD%9C%E4%B8%BA%E4%B8%80%E4%B8%AA%E5%9B%A0%E5%BC%8F%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B91.3%28x%2By%29%5E2-7%28x-y%29-9%28x%2By%29%5E2-6%28x-y%292.3%28a-b%29%2B6%28a%2Bb%29-2%28a%2Bb%29%2B6%28a-b%29%E6%B3%A8%EF%BC%9A%5E2%E8%A1%A8%E7%A4%BAx%E7%9A%842%E6%AC%A1%E6%96%B9%3F)
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把(x+y),(x-y),(a+b),(a-b)作为一个因式合并同类项1.3(x+y)^2-7(x-y)-9(x+y)^2-6(x-y)2.3(a-b)+6(a+b)-2(a+b)+6(a-b)注:^2表示x的2次方?
把(x+y),(x-y),(a+b),(a-b)作为一个因式合并同类项
1.
3(x+y)^2-7(x-y)-9(x+y)^2-6(x-y)
2.
3(a-b)+6(a+b)-2(a+b)+6(a-b)
注:^2表示x的2次方?
把(x+y),(x-y),(a+b),(a-b)作为一个因式合并同类项1.3(x+y)^2-7(x-y)-9(x+y)^2-6(x-y)2.3(a-b)+6(a+b)-2(a+b)+6(a-b)注:^2表示x的2次方?
1、-6(x+y)^2-13(x-y)
2、4(a+b)+9(a-b)
1, 原式=-6(x+y)^2-13(x-y)不知道要展开不。。
2, 原式=3a-3b+6a+6b-2a-2b+6a-6b
=13a-5b
3(x+y)^2-7(x-y)-9(x+y)^2-6(x-y)
=3x^2+3y^2+2xy-7x-7y-9x^2-y^2-2xy-6x+6y
=-6x^2+2y^2-13x-y
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