中括号3(x+y)的4次方-0.5(x+y)平方-x-y)/(x+y)

问题描述:

中括号3(x+y)的4次方-0.5(x+y)平方-x-y)/(x+y)

x+y 不等于 0 别忘

[3(x+y)^4-0.5(x+y)^2-x-y)]/(x+y)
=(x+y)[3(x+y)^3-0.5(x+y)-1]/(x+y)
=[3(x+y)^3-0.5(x+y)-1]
=1/2[6(x+y)^3-(x+y)-2]