Toán Lớp 8: 2.x^2+3.(x-1).(x+1)=5x(x+1)
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Toán Lớp 8: 2.x^2+3.(x-1).(x+1)=5x(x+1)
Tìm X
Comments ( 2 )
2x^2+3[(x)^2-(1)^2]=5x^2+5x
2x^2+3(x^2-1)=5x^2+5x
2x^2+3x^2-3=5x^2+5x
2x^2+3x^2-5x^2-5x=3
-5x=3
x=3/-5
vậy x=-3/5