Toán Lớp 7: Tìm x
35-228 : ( x – 3 ) ^ 2 = 27
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Toán Lớp 7: Tìm x
35-228 : ( x – 3 ) ^ 2 = 27
Comments ( 2 )
=>288:(x-3)^2=35-27
=>288:(x-3)^2=8
=>(x-3)^2=288:8
=>(x-3)^2=36
=>(x-3)^2=(+-6)^2
=>[(x-3=6),(x-3=-6):}
=>[(x=6+3),(x=-6+3):}
=>[(x=9),(x=-3):}
Vậy x\in{9;-3}