Toán Lớp 9: Tìm x nha
x(5 – 2x) + 2x(x – 1) = 15
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Toán Lớp 9: Tìm x nha
x(5 – 2x) + 2x(x – 1) = 15
Comments ( 2 )
= 5x – 2x^2 + 2x^2 – 2x = 15
<=> 3x = 15
<=> x = 5