1:-5x³y+20xy³;2:(a+b)²-4(a+b-1);
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1:-5x³y+20xy³;2:(a+b)²-4(a+b-1);
1:-5x³y+20xy³;
2:(a+b)²-4(a+b-1);
1:-5x³y+20xy³;2:(a+b)²-4(a+b-1);
1:-5x³y+20xy^3
=-5xy(x²-4y²)
=-5xy(x-2y)(x+2y)
2:(a+b)²-4(a+b-1)
=(a+b)²-4(a+b)+4
=(a+b-2)²
1:-5x³y+20xy³;
=-5xy(x²-4)
=-5xy(x-2)(x+2)
2:(a+b)²-4(a+b-1);
=(a+b)²-4(a+b)+4
=(a+b-2)²
1.5xy(2y+x)(2y-x)
2.(a+b-2)^2