81(a+b)²-4(a-b)² 2x³y+8x²y²+8xy³
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81(a+b)²-4(a-b)² 2x³y+8x²y²+8xy³
81(a+b)²-4(a-b)² 2x³y+8x²y²+8xy³
81(a+b)²-4(a-b)² 2x³y+8x²y²+8xy³
81(a+b)²-4(a-b)²
=[9a+9b+2a-2b][9a+9b-2a+2b]
=(11a+7b)(7a+11b)
2x³y+8x²y²+8xy³
=xy(2x²+8xy+8y²)
=2xy(x+2y)²
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因式分
81(a+b)²-4(a-b)²
=[9(a+b)+2(a-b)][9(a+b)-2(a-b)]
=(11a+7b)(7a+11b)
2x³y+8x²y²+8xy³
=2xy(x²+4xy+4y²)
=2xy(x+2y)²
您好:
81(a+b)²-4(a-b)²
=[9(a+b)+2(a-b)][9(a+b)-2(a-b)]
=(11a+7b)(7a+11b)
2x³y+8x²y²+8xy³
=2xy(x²+4xy+4y²)
=2xy(x+2y)²
不明白,可以追问
如有帮助,记得采纳,谢谢
祝学习进步!