x+3y+（x-3y）分之（9y方）+（9y方-x方）分之（6x方y）求过程
问题描述：
x+3y+（x-3y）分之（9y方）+（9y方-x方）分之（6x方y）求过程
答
=(x+3y)(x-3y)/(x-3y)+9y² /(x-3y)-6x²y/(x+3y)(x-3y)=(x²-9y²+9y²) /(x-3y)-6x²y/(x+3y)(x-3y)=x² /(x-3y)-6x²y/(x+3y)(x-3y)=[x²(x+3y)-6x²y]/(x+3y)(x-3y)=(x...