俊狼猎英团队为您
1、(x+3y)(x2+9y2)(x-3y)
=[(X+3Y)(X-3Y)](X^2+9Y^2)
=(X^2-9Y^2)(X^2+9Y^2)
=X^4-81Y^4
2、4x(a-b)-8y(b-a)
=4X(a-b)+8Y(a-b)
=2(a-b)(X+2Y)
3、-4a²+24a-36
=-4(a^2-6a+9)
=-4(a-3)^2
俊狼猎英团队为您
1、(x+3y)(x2+9y2)(x-3y)
=[(X+3Y)(X-3Y)](X^2+9Y^2)
=(X^2-9Y^2)(X^2+9Y^2)
=X^4-81Y^4
2、4x(a-b)-8y(b-a)
=4X(a-b)+8Y(a-b)
=2(a-b)(X+2Y)
3、-4a²+24a-36
=-4(a^2-6a+9)
=-4(a-3)^2