3x鲁-銆恱鲁+(6x虏-7y)+2(x虏-3x虏+4y)銆戝寲绠

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：数学作业时间：2024/04/28 08:43:09

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

3x³-[x³+（6x²-7y）+2（x²-3x²+4y）]
=3x³-(x³+6x²-7y+2x²-6x²+8y）
=3x³-(x³+2x²+y）
=3x³-x³-2x²-y
=2x³-2x²-y

x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 (3x-4y)(5x-4y)-(7x-8y)(6y-5x) 因式分解3x^2(x-y)+6x(y-x) 化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)² x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方若(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 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1