1) (x – 12) – (2x + 31) = -6 – 5 2) -2 . (x + 7) + 3 . (x – 2) = -2 Mik đang cần gấp giúp mik với

0 bình luận về “1) (x – 12) – (2x + 31) = -6 – 5 2) -2 . (x + 7) + 3 . (x – 2) = -2 Mik đang cần gấp giúp mik với”

1. Giải thích các bước giải:

   `1) (x – 12) – (2x + 31) = -6 – 5`
   `=>x-12-2x-31=-11`
   `=>x-2x-12-31=-11`
   `=>x.(1-2)-(12+31)=-11`
   `=>x.(-1)-43=-11`
   `=>x.(-1)=-11+43`
   `=>x.(-1)=32`
   `=>x=32:(-1)`
   `=>x=-32`
   `2) -2 . (x + 7) + 3 . (x – 2) = -2`
   `=>-2.x+(-14)+3.x-6=-2`
   `=>-2.x+3.x+(-14)-6=-2`
   `=>x.(-2+3)-20=-2`
   `=>x.1=-2+20`
   `=>x.1=18`
   `=>x=18:1`
   `=>x=18`

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2. Đáp án

   (x−12)−(2x+31)=−6−51)(x-12)-(2x+31)=-6-5
   x−12−2x−31=−11
   x−2x−12−31=−11
   x.(1−2)−(12+31)=−11
   x.(−1)−43=−11
   x.(−1)=−11+43
   x.(−1)=32
   x=32:(−1)
   x=−32
   2)−2.(x+7)+3.(x−2)=−22)-2.(x+7)+3.(x-2)=-2
   −2.x+(−14)+3.x−6=−2
   −2.x+3.x+(−14)−6=−2
   x.(−2+3)−20=−2
   x.1=−2+20
   x.1=18

   x.1=18

   x=18:1
   x=18

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