求下列各式的X.(x-1)²=25 3(X-1)³-81=0
问题描述:
求下列各式的X.(x-1)²=25 3(X-1)³-81=0
答
(x-1)²=25
x-1=5 或x-1=-5
x=6 或x=-4
3(X-1)³-81=0
3(X-1)³=81
(X-1)³=27
x-1=3
x=4