求下列各式中x的值:25(x-1)²=49;343(x+1)³=27.
问题描述:
求下列各式中x的值:25(x-1)²=49;343(x+1)³=27.
答
-
( 5(X-1))^2=7^2
5(X-1)=7
X=7/5+1
X=12/5
-
7^3 (X+1)^3=3^3
(7(X+1))^3=3^3
7(X+1)=3
X=3/7-1
X= -4/7
更容易吧 望采纳\(^o^)/~
答
25(x-1)²=49
(x-1)²=49/25
x-1=7/5
x=1+7/5=12/5
343(x+1)³=27
(x+1)³=27/343
x+1=3/7
x=3/7-1=-4/7