Toán Lớp 8: tìm x : x.(5x+6)-5(x^2+x+3)=20
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Toán Lớp 8: tìm x : x.(5x+6)-5(x^2+x+3)=20
Comments ( 2 )
=> 5x^2+6x-5x^2-5x-15=20
=> x-15=20
=> x=20+15=35