因式分解:① (x+y)^2-(3x-2y)^2 ②9(2a+3b)^2-25(3a-b)^2 ③a^3+4a^2b+4
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因式分解:① (x+y)^2-(3x-2y)^2 ②9(2a+3b)^2-25(3a-b)^2 ③a^3+4a^2b+4ab^2 (每道题要过程,谢谢)
![因式分解:① (x+y)^2-(3x-2y)^2 ②9(2a+3b)^2-25(3a-b)^2 ③a^3+4a^2b+4](/uploads/image/z/8629212-12-2.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%E2%91%A0+%28x%2By%29%5E2-%283x-2y%29%5E2+%E2%91%A19%282a%2B3b%29%5E2-25%283a-b%29%5E2+%E2%91%A2a%5E3%2B4a%5E2b%2B4)
①(x+y)²-(3x-2y)²
=[(x+y)+(3x-2y)][(x+y)-(3x-2y)]
=(4x-y)(-2x+3y)
②9(2a+3b)²-25(3a-b)²
=[3(2a+3b)+5(3a-b)][3(2a+3b)-5(3a-b)]
=(21a+4b)(-9a+14b)
③a³+4a²b+4ab²
=a(a²+4ab+4b²)
=a(a+2b)²
如果不懂,请Hi我,祝学习愉快!
=[(x+y)+(3x-2y)][(x+y)-(3x-2y)]
=(4x-y)(-2x+3y)
②9(2a+3b)²-25(3a-b)²
=[3(2a+3b)+5(3a-b)][3(2a+3b)-5(3a-b)]
=(21a+4b)(-9a+14b)
③a³+4a²b+4ab²
=a(a²+4ab+4b²)
=a(a+2b)²
如果不懂,请Hi我,祝学习愉快!
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