2(2y-3)÷0.1-2.5=(0.02-2y)÷0.02-7.5

(y^2)^4y-(-2y)^3y^6= 数学题=y(y+3)-4(y+3)2=(y+3)(y-4y-12) 2(2y-3)÷0.1-2.5=(0.02-2y)÷0.02-7.5 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 (x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3 已知xy=-2,x-y=3,求（x+y)（x-y)-y^2+（x-y)^2-（6x^2y-2xy^2)÷2y 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 (y^2-3y+2)(y^2+3y-2)=y^2(y+3)(y-3) 分数用完了。 解方程：（y-3y+2）（y+3y-2）=y（y+3）（y-3） 4y²-4y/y²-2y+1÷(y+1/y-1-y-1/y+1)÷(3y+3) 6y-(y+2分之y+2-y分之y)÷(y^3-4y-2y^2+8分之y) 怎么算 (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , (y-4)(3y+2)-(3y-7)(2y+1),其中y=4/3 先化简再求值:(x+y)(x-y)+(x^2-2xy+y^2)-(x^2y)^3÷(x^2y)^2,其中x=1,y=2. 解方程3y^2-(2y+1)(y-2)=(y-5)(y-1) 2y+5/3y-6-y/2=5y-4/2y-4