化简求值 -3(2x-y)-{7x-〔6x+2x-(10x-8y)〕-x-2(3x-4y)}
化简求值 -3(2x-y)-{7x-〔6x+2x-(10x-8y)〕-x-2(3x-4y)}
化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1
化简求值:(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y),其中x=2,y=-1
化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y) 其中x=2,y
先化简再求值:-3(2x-y)-{7-〔6x+2y-(10x-8y)〕+x-2(3x-4y)}已知x=-1/5,y=-5
化简求值:2(x-2y)^2-4(x-2y)+(x-2y)^2-3(x-2y),
初二化简求值题[(5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3
化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1
求值(2x+y)(2x-y)+3(2x-y)^2+(-3x)(3x-4y)+(4x^5-6x^3)/2(-x)^3
化简求值8x的平方-5x(4y-x)+4x ×(-4x+5/2y)x=1 y=3
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
化简求值(2x+3y)平方-( 2x+y)(2x-y)