Question

Tìm x:

(3x-5)/(2x+7)=(4x+8)/(5x-4)

Giải chi tiết hộ mì nha, mì cảm ơn

Answer 1

\(\frac{3x-5}{2x+7}=\frac{4x+8}{5x-4}\)

\(\left(3x-5\right)\left(5x-4\right)=\left(4x+8\right)\left(2x+7\right)\)

\(15x^2-12x-10x+20=8x^2+28x+16x+56\)

\(15x^2-8x^2-12x-10x-28x-16x+20-56=0\)

\(7x^2-66x-36=0\)

bạn tự làm tiếp nha

Answer 2

(3x-5)/(2x+7)=(4x+8)/(5x-4)

<=>(3x-5)(5x-4)=(4x+8)(2x+7)

<=>15x-20=8x+56

<=>15x-8x=56+20

<=>7x=76

<=>x=76:7=76/7

Answer 3

\(\frac{3x-5}{2x+7}=\frac{4x+8}{5x-4}\)

\(\left(3x-5\right)\left(5x-4\right)=\left(4x+8\right)\left(2x+7\right)\)

\(3x.5x-4.3x-5.5x+5.4=4x.2x+7.4x+8.2x+8.7\)

\(15x^2-12x-10x+20=8x^2+28x+16x+56\)

\(15x^2-22x+20=8x^2+44x+56\)

\(15x^2-22x+20-8x^2-44x-56=0\)

\(7x^2-66x-36=0\)

Answer 4

Mấy bạn làm đúng rồi đó 

k tui nha

thanks