Contact us
Choose a category below so we can get back to you as quickly as possible.
^表示乘方 原式=5(x+y)³;-2(x-y)^4-2(x+y)³;+(y-x)^4 =[5(x+y)³;-2(x+y)³;]+[-2(x-y)^4+(x-y)^4] =3(x+y)³;-(x-y)^4
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.