先化简,后求值(x+5y)(x+4y)(x-y)(x+y),其中,x=-2又2/3,y=3/7
先化简,后求值(x+5y)(x+4y)(x-y)(x+y),其中,x=-2又2/3,y=3/7
先化简,后求值(x+5y)(x+4y)(x-y)(x+y),其中,x=-2又2/3,y=3/7,用公式计算
先化简在求值 (x+5y)(x+4y)-(x-y)(x+y),其中,x=-2又2/3,y=3/7
先化简,后求值(x+5y)(x+4y)-(x-y)(x+y),其中,x等于负2又3分之2,y等于7分之3
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
先化简,再求值:[(5X+2Y)(3X+2Y)+(X-2Y)(X+2Y)]/4X,其中X=2,Y=-3
先化简,再求值:x²/x-y-y²/x-y,其中x=1+2又根号3
化简求值(x+5y)(x+4y)-(x-y)(x+y),其中x=一又2/5,y=-1/7
先化简,再求值:[(3x-y)(2x+4y)-(x+2y)(5x-2y)],其中x=-2,y=1
化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1
初二化简求值题[(5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3