(-y²/3x)³÷6x²y^7÷(-1/9x²y)² 计算

计算 [12(x+y)³(y-x)]³÷[4(x+y)²（x-y)]² 计算6x³y^6÷(1/2)y³÷(-3x²y)-(12x^4y^6-8x²y^ x·（9x³y-3xy²)÷（﹣3x²y) 计算 (x-y)³+9(x-y)-6(x-y)² 计算：(x+2y)(3x-5y)-(6x的四次方y²-2x²y²）÷（2x²y& [(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做? 计算4（x+y）^5（x-y）^4÷[2（x+y）³*（y-x）²] 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) 计算(3x的4次方y+6x³y-3x²y)÷(3x²y)的结果是? 利用公式计算(x²-y²)÷(x+y) 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值