请问怎样解方程81(X-1)²=25?
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请问怎样解方程81(X-1)²=25?
请问怎样解方程81(X-1)²=25?
请问怎样解方程81(X-1)²=25?
81(X-1)²=25
方程两边同时开方,得:
9(x-1)=±5
当9(x-1)=5 时,
x=14/9
当9(x-1)=-5 时,
x=4/9 .
(X-1)2=25/81
x-1=5/9或-5/9
x=14/9或4/9