（7x^2-y^2)^2-(x^2-7y^2)^2急

来源：学生作业帮助网编辑：六六作业网时间：2024/11/24 08:52:08

（7x^2-y^2)^2-(x^2-7y^2)^2急（7x^2-y^2)^2-(x^2-7y^2)^2急（7x^2-y^2)^2-(x^2-7y^2)^2急原式=[(7x^2-y^2)+(x^2-7y

（7x^2-y^2)^2-(x^2-7y^2)^2急
（7x^2-y^2)^2-(x^2-7y^2)^2
急

（7x^2-y^2)^2-(x^2-7y^2)^2急
原式=[(7x^2-y^2)+(x^2-7y^2)][(7x^2-y^2)-(x^2-7y^2)]
=(7x^2-y^2+x^2-7y^2)(7x^2-y^2-x^2+7y^2)
=(8x^2-8y^2)(6x^2+6y^2)
=48(x+y)(x-y)(x^2+y^2)

（7x^2-y^2)^2-(x^2-7y^2)^2
=（7x^2-y^2+x^2-7y^2)(7x^2-y^2-x^2+7y^2)
=48(x^2-y^2)(x^2+y^2)
=48(x+y)(x-y)(x^2+y^2)

化简3(x-y)-7(x--y)+2(y-x) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 [(x+2y)²-(x+y)(x-y)-7y²】÷（2y） x+2y=2x+y+1=7x-y 求：2x-y? (-3x+7y)(-7y-3x)-(x-3y)(2x+3y) 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 (x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值（x-y)^2+7(x+y)-11(x-y)^2-8(X+Y)的计算过程 3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项. x^2+y^2=15,x+y=7,x＞y,求x-y 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y) 18(x+y)^8(x-y)^7÷[3(x+y)^3(x-y)^3]^2 当x+y=2时7(x+y)一(x+y)+(x+y)=?