化简:(1)a^2-2(ab-b^2)-b^2 (2)(x^2-y^2)-3(2x^2-3y^2) (3)7a^b-(-4a^2b+5ab^2)-2(2a^b-3ab^2)
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![化简:(1)a^2-2(ab-b^2)-b^2 (2)(x^2-y^2)-3(2x^2-3y^2) (3)7a^b-(-4a^2b+5ab^2)-2(2a^b-3ab^2)](/uploads/image/z/2506276-28-6.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A%EF%BC%881%EF%BC%89a%5E2-2%28ab-b%5E2%29-b%5E2+%282%29%28x%5E2-y%5E2%29-3%282x%5E2-3y%5E2%29+%283%297a%5Eb-%28-4a%5E2b%2B5ab%5E2%29-2%282a%5Eb-3ab%5E2%29)
化简:(1)a^2-2(ab-b^2)-b^2 (2)(x^2-y^2)-3(2x^2-3y^2) (3)7a^b-(-4a^2b+5ab^2)-2(2a^b-3ab^2)
化简:(1)a^2-2(ab-b^2)-b^2 (2)(x^2-y^2)-3(2x^2-3y^2) (3)7a^b-(-4a^2b+5ab^2)-2(2a^b-3ab^2)
化简:(1)a^2-2(ab-b^2)-b^2 (2)(x^2-y^2)-3(2x^2-3y^2) (3)7a^b-(-4a^2b+5ab^2)-2(2a^b-3ab^2)
(1)a^2-2(ab-b^2)-b^2
=a^2-2ab+2b^2-b^2
=a^2-2ab+b^2
(2)(x^2-y^2)-3(2x^2-3y^2)
=x^2-y^2-6x^2+9y^2
=x^2-6x^2-y^2+9y^2
=-5x^2+8y^2
(3)7a^2b-(-4a^2b+5ab^2)-2(2a^2b-3ab^2)
=7a^2b+4a^2b-5ab^2-4a^2b+6ab^2
=7a^2b+4a^2b-4a^2b-5ab^2+6ab^2
=7a^2b+ab^2
1 原式=a^2-2ab+2b^2-b^2
=a^2-2ab+b^2
=(a-b)^2
解2 原式=x^2-y^2-6x^2+9y^2
=8y^2-5x^2
=(2√ 2y+√ 5x)(2√ 2y-...
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1 原式=a^2-2ab+2b^2-b^2
=a^2-2ab+b^2
=(a-b)^2
解2 原式=x^2-y^2-6x^2+9y^2
=8y^2-5x^2
=(2√ 2y+√ 5x)(2√ 2y-√ 5x)
解3 原式=7a^2b+4a^2b-5ab^2-4a^2b+6ab^2
=7a^2b+ab^2
=ab(7a+b)
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