（x+y)^3(2x+2y）^3(3x+3y)^3
=（x+y)³乘以4(x+y)³乘以27(x+y)³
=108(x+y)^9有没有详细步骤啊 谢谢啦这个就是有必要的步骤。但是看不懂啊帮帮忙吧谢谢了啊（x+y)^3(2x+2y）^3(3x+3y)^3 =（x+y)³乘以[2(x+y)]³乘以[3(x+y)]³ =（x+y)³乘以4(x+y)³乘以27(x+y)³ =108(x+y)^9