1.已知x+y=5,xy=2,则x^4 y^3+x^3 y^4 2.因式分解0.25X²-0.01y² 3.因式分解(a-b)²-c
问题描述:
1.已知x+y=5,xy=2,则x^4 y^3+x^3 y^4 2.因式分解0.25X²-0.01y² 3.因式分解(a-b)²-c
答
①x^4y³+x³y^4
=x³y³(x+y)
=2³×5
=40
②0.25x²-0.01y²
=(0.5x)²-(0.1y)²
=(0.5x-0.1y)(0.5x+0.1y)
③(a-b)²-c²
=(a-b-c)(a-b+c)