因式分解:(1).9x³y+6x²y²+xy³ (2).196(x+y)²-169(x-

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因式分解:(1).9x³y+6x²y²+xy³ (2).196(x+y)²-169(x-
因式分解:(1).9x³y+6x²y²+xy³ (2).196(x+y)²-169(x-y)²

:(1).9x³y+6x²y²+xy³ =xy(9x^2+ 6xy+y^2)=xy(3x+y)^2(2).196(x+y)²-169(x-y)²=[14(x+y)+13(x-y)][14(x+y)-13(x-y)]=(27x+y)(x+27y)