Tìm x : 5.(x+12)+22=92 3.(x+23)+6=96 95-5.(x+2)=45 155-10.(x+1)=55 15x-133=17 17x-20=14 14x+54=82 (x-105):21=15 2448:[119-(x-6)]=24 (4x+5):3-121:11=4

0 bình luận về “Tìm x : 5.(x+12)+22=92 3.(x+23)+6=96 95-5.(x+2)=45 155-10.(x+1)=55 15x-133=17 17x-20=14 14x+54=82 (x-105):21=15 2448:[119-(x-6)]=24 (4x+5):3-121:11=4”

1. 5.(x+12)+22=92 => 5.(x+12) = 70 => x + 12 = 14 => x = 2

   3.(x+23)+6=96 => 3.(x+23) = 90 => x+23 = 30 => x = 7

   95-5.(x+2)=45 => 5.(x+2) = 50 => x+2 = 10 => x = 8

   155-10.(x+1)=55 => 10.(x+1) = 100 => x+1=10 => x = 9

   15x-133=17 => 15x = 150 => x = 10

   17x-20=14 => 17x = 34 => x = 2

   14x+54=82 => 14x = 28 =>  x = 2

   (x-105):21=15 => x-105 = 315 => x = 420 

   2448:[119-(x-6)]=24 => 119-(x-6) = 102 => x-6=17 => x = 23

   (4x+5):3-121:11=4 => (4x+5):3 – 11 = 4 => (4x+5):3 = 15 => 4x+5 = 45 => 4x = 40 => x = 10 

   5x-x=84 => 4x = 84 => x = 21

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2. 1, 5.(x+12)+22=92

   ⇔5x+60+22=92

   ⇔5x+82=92

   ⇔5x=92-82

   ⇔5x=10

   ⇔x=2

   2, 3.(x+23)+6=96

   ⇔3x+69+6=96

   ⇔3x+75=96

   ⇔3x=96-75

   ⇔3x=21

   ⇔x=7

   3, 95-5.(x+2)=45

   ⇔5(x+2)=50

   ⇔x+2=10

   ⇔x=8

   4, 155-10.(x+1)=55

   ⇔10(x+1)=100

   ⇔x+1=10

   ⇔x=9

   5, 15x-133=17

   ⇔15x=17+133

   ⇔15x=150

   ⇔x=10

   6, 17x-20=14

   ⇔17x=14+20

   ⇔17x=34

   ⇔x=2

   7, 14x+54=82

   ⇔14x =82-54

   ⇔14x=28

   ⇔x=2

   8, (x-105):21=15

   ⇔x-105=315

   ⇔x=315+105

   ⇔x=420

   9, 2448:[119-(x-6)]=24

   ⇔119-(x-6)=102

   ⇔x-6=17

   ⇔x=23

   10, (4x+5):3-121:11=4

   ⇔(4x+5):3-11=4

   ⇔(4x+5):3=15

   ⇔4x+5=45

   ⇔4x=40

   ⇔x=10

   11, 5x-x=84

   ⇔4x=84

   ⇔x=21

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