Toán Lớp 8: tìm x biết
a) (3x+4)^2-(3x-1)(3x+1)=49
b) x^2-4x+4=9(x-2)
c) x^2-25=3x-15
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Toán Lớp 8: tìm x biết
a) (3x+4)^2-(3x-1)(3x+1)=49
b) x^2-4x+4=9(x-2)
c) x^2-25=3x-15
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