1) Tìm x a) 4x – 10 = 13 b) -12 + x = 20 c) 7x – 4 = 24 d)17 – x = 7 e) 8x + |- 3 | = – 21 f) 4x – 40 = | – 4 | + 12

0 bình luận về “1) Tìm x a) 4x – 10 = 13 b) -12 + x = 20 c) 7x – 4 = 24 d)17 – x = 7 e) 8x + |- 3 | = – 21 f) 4x – 40 = | – 4 | + 12”

1. `#Xray`

   `a)4x-10=13`

   `⇒4x=10+13=23`

   `⇒x=23/4`

   `b)-12+x=20`

   `⇒x=20-(-12)=20+12=32`

   `c)7x-4=24`

   `⇒7x=24+4=28`

   `⇒x=4`

   `d)17-x=7`

   `⇒x=17-7=10`

   `e)8x+|-3|=-21`

   `⇒8x=-21-3=-24`

   `⇒x=-3`

   `f)4x-40=|-4|+12`

   `⇒4x=40+4+12=56`

   `⇒x=56:4=14`

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2. a)4x-10=13

   4x=13+10

   4x=23

   x=23:4

   x=$\frac{23}{4}$ 

   b) -12 + x = 20

   x=20-(-12)

   x=32

   c) 7x – 4 = 24

   7x=24+4

   7x=28

   x=28:7

   x=4

   d)17 – x = 7

   x=17-7

   x=10

   e) 8x + |- 3 | = – 21

   8x+3=-21

   8x=-21-3

   8x=-24

   x=-24:8

   x=-3

   f) 4x – 40 = | – 4 | + 12

   4x-40=4+12

   4x-40=16

   4x=40+16

   4x=56

   x=56:4

   x=14

   Học tốt nhé<3

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