3x鲁-銆恱鲁+(6x虏-7y)+2(x虏-3x虏+4y)銆戝寲绠3x³-[x³+（6x²-7y）+2（x²-3x²+4y）]化简，y=1

3(x-y)^2-7(x-y)+8(y-x)^2+6(y-x)合并同类项. 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 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 因式分解3x^2(x-y)+6x(y-x) 3x鲁-銆恱鲁+(6x虏-7y)+2(x虏-3x虏+4y)銆戝寲绠3x³-[x³+（6x²-7y）+2（x²-3x²+4y）]化简，y=1 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 3x+5y-(x+y)=6 2(x+y)-3x=-7 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 化简3(x-y)-7(x--y)+2(y-x) 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x (2X-Y)-2(3X-1/2Y) 6(X/3+X-1/2) (X-3)-(5X+7) -4X-(-(3/1X)+(-1/4X) - 3x鲁-(x鲁+6x虏-7)-2(x鲁-3x虏-4x),x=-2 将(x-y)看成一个整体,将3(x-y)²-4(x-y)+7(x-y)-6(y-x)²-2(y-x)合并同类项. x(x-y)2-(y-x)3