Question

tìm x y biết 2 . ( x -1 ) mũ 2 - 3 = 5

Answer 1

2 . (x-1)² -3 =5

2.(x-1)²=5+3

2.(x-1)²=8

(x-1)²=8 : 2

(x-1)²=4

(x-1)²=2²

=>x-1=2

    x=2+1 

    x=3

Answer 2

dễ quá đi 3

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