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~

0 bình luận về “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~”

1. 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`

    

   Trả lời

2. 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~

   Cho mik xin câu tl hay nhất nhoa ^^

    

   Trả lời