a, ( 3x – 1 ) (-1/2 x + 5 ) = 0
b, -2/3 – 1/3 ( 2x – 5 ) = 3/2
c, x-12/4 = 1/2
Giúp mình vs
a, ( 3x – 1 ) (-1/2 x + 5 ) = 0 b, -2/3 – 1/3 ( 2x – 5 ) = 3/2 c, x-12/4 = 1/2 Giúp mình vs
By Eloise
By Eloise
a, ( 3x – 1 ) (-1/2 x + 5 ) = 0
b, -2/3 – 1/3 ( 2x – 5 ) = 3/2
c, x-12/4 = 1/2
Giúp mình vs
Đáp án: + Giải thích các bước giải:
`a//`
`(3x – 1)(-1/(2x+5)) = 0`
`\to 3x – 1= 0`
`\to 3x = 1`
`\to x = 1/3`
Vậy `x = 1/3`
`b//`
`-2/3 – 1/3 ( 2x – 5 ) = 3/2`
`\to -1/3 (2x – 5) = 13/6`
`\to 2x – 5 = -13/2`
`\to 2x = -3/2`
`\to x = – 3/4`
Vậy `x = -3/4`
`c//`
`x – 12/4 = 1/2`
`\to x = 1/2 + 12/4`
`\to x = 14/4`
Vậy `x = 14/4`
`a,`
`( 3x – 1 ) (-1/2 x + 5 ) = 0`
`⇒3x-1=0`
`⇒3x=1`
`⇒x=1/3`
`hoặc`
`(-1/2 x + 5 ) = 0`
`⇒-1/2x=-5`
`⇒x=10`
`b,`
`-2/3 – 1/3 ( 2x – 5 ) = 3/2`
`⇒ – 1/3 ( 2x – 5 ) = -2/3 – 3/2`
`⇒ – 1/3 ( 2x – 5 ) = -13/6`
`⇒2x – 5 = -13/6 : -1/3`
`⇒2x-5=13/2`
`⇒2x=13/2 +5`
`⇒2x=23/2`
`⇒x=23/4`
`c,`
`x-12/4 = 1/2`
`⇒x=1/2 + 12/4`
`⇒x=7/2`