a) 8.(x-|-7|- 6.(x-2) = |-8|.6-50
b) 2.(4x-8) -7.(3+x ) = |-4|.(3-2)
c) 12.(x+4) +6.(x-2)-16.(x+3) =7.|-4|
~giúp mình với ạ~
a) 8.(x-|-7|- 6.(x-2) = |-8|.6-50
b) 2.(4x-8) -7.(3+x ) = |-4|.(3-2)
c) 12.(x+4) +6.(x-2)-16.(x+3) =7.|-4|
~giúp mình với ạ~
Đáp án:
`a) 8.(x-|-7|)-6.(x-2)=|-8|.6-50`
`=> 8.(x-7)-6x+12=8.6-50`
`=> 8x-56-6x+12=48-50`
`=> 2x-44=-2`
`=> 2x=(-2)+44=42`
`=> x=21`
Vậy `x=21`
`b) 2.(4x-8) -7.(3+x ) = |-4|.(3-2)`
`=> 8x-16-21-7x= 4.1`
`=> x-37=4`
`=> x=41`
Vậy `x=41`
`c) 12.(x+4) +6.(x-2)-16.(x+3) =7.|-4|`
`=> 12x+48+6x-12-16x-48=7.4`
`=> 2x-12=28`
`=> 2x=40`
`=> x=20`
Vậy `x=20`
a)8.( x – |-7 |) – 6.( x – 2 ) = |-8| . 6 – 50
⇔8( x – 7 ) – 6( x – 2 ) = 8 . 6 – 50
⇔8x – 56 – 6x + 12 – 48 + 50 = 0
⇔2x – 42 =0
⇔2x =42
⇔x =21
Vậy x=21
b)2.(4x-8) -7.(3+x ) = |-4|.(3-2)
⇔8x-16-21-7x= 4
⇔x – 37 =4
⇔ x=41
Vậy x=41
c)12.(x+4) +6.(x-2)-16.(x+3) =7.|-4|
⇔12 (x-4) +6 (x-2) – 16 (x+3) =7.4
⇔48+12x+12+6x-48-16x=28
⇔12x+6x-16x=28-48-12+48
⇔12x+6x-16x=16+(48-48)
⇔12x+6x-16x=16
⇔ 2x=16
⇔x=16:2
⇔x=8
CHÚC BẠN HỌC TỐT~
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