Toán Lớp 8: (5x + 1) (2x – 5) – 10x (x – 2) = 4x +1
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Toán Lớp 8: (5x + 1) (2x – 5) – 10x (x – 2) = 4x +1
Comments ( 2 )
<=>10x^2-25x+2x-5-10x^2+20x=4x+1
<=>(10x^2-10x^2)+(20x-25x+2x)-5=4x+1
<=>-3x-4x-1-5=0
<=>-7x=0+1+5
<=>-7x=6
<=>x=-6/7
Vậy phương trình có nghiệm S={-6/7}