Tìm x biết: a, 5.(3x-2)-4.(x+1)=3.(x-3) b, x.(x-1)+x.(2x-3)= 3x .(x-1)+5 Giúp mik vs ctlhn luôn 21/08/2021 Bởi Adalyn Tìm x biết: a, 5.(3x-2)-4.(x+1)=3.(x-3) b, x.(x-1)+x.(2x-3)= 3x .(x-1)+5 Giúp mik vs ctlhn luôn
Đáp án+Giải thích các bước giải: `a)5(3x-2)-4(x+1)=3(x-3)` `->15x-10-4x-4=3x-9` `->11x-14=3x-9` `->11x-3x=-9+14` `->8x=5` `->x=5/8` Vậy `x=5/8` `b)x(x-1)+x(2x-3)=3x(x-1)+5` `->x^2-x+2x^2-3x=3x^2-3x+5` `->3x^2-4x=3x^2-3x+5` `->3x^2-3x^2-4x+3x-5=0` `->-x=5` `->x=-5` Vậy `x=-5` Bình luận
$a,5(3x-2)-4(x+1)=3(x-3)$ $⇔15x-10-4x-4=3x-9$ $⇔15x-10-4x-4-3x+9=0$ $⇔8x-5=0$ $⇔x=\frac{5}{8}$ $b, x.(x-1)+x.(2x-3)= 3x .(x-1)+5$ $⇔x^2−x+2x^2−3x=3x^2−3x+5$ $⇔x^2−x+2x^2−3x=3x^2−3x+5$ $⇔−4x=−3x+5$ $⇔−4x+3x=5$ $⇔x=-5$ Bình luận
Đáp án+Giải thích các bước giải:
`a)5(3x-2)-4(x+1)=3(x-3)`
`->15x-10-4x-4=3x-9`
`->11x-14=3x-9`
`->11x-3x=-9+14`
`->8x=5`
`->x=5/8`
Vậy `x=5/8`
`b)x(x-1)+x(2x-3)=3x(x-1)+5`
`->x^2-x+2x^2-3x=3x^2-3x+5`
`->3x^2-4x=3x^2-3x+5`
`->3x^2-3x^2-4x+3x-5=0`
`->-x=5`
`->x=-5`
Vậy `x=-5`
$a,5(3x-2)-4(x+1)=3(x-3)$
$⇔15x-10-4x-4=3x-9$
$⇔15x-10-4x-4-3x+9=0$
$⇔8x-5=0$
$⇔x=\frac{5}{8}$
$b, x.(x-1)+x.(2x-3)= 3x .(x-1)+5$
$⇔x^2−x+2x^2−3x=3x^2−3x+5$
$⇔x^2−x+2x^2−3x=3x^2−3x+5$
$⇔−4x=−3x+5$
$⇔−4x+3x=5$
$⇔x=-5$