a) X: 13 = 41
b) 1428:x = 14
c) 7x -8 = 713
d) 8( x – 3) = 0
e) 4x : 17 = 0
f) 0: x = 0
g) 0.x = 0
h) 18:6 – x: 2 = 0
1) ( x – 35) – 120 = 0
m) 156 – (x+ 61) = 82
n) 124 + (118 – x) = 217
j) ( 567 – x ) + 121 = 64
a) X- 50: 25 = 8
b) (x – 50): 25 = 8
c) X – 105 : 21 = 15
d) (x – 105): 21 = 15
g) 5X – 36 : 18 = 13
h) (5x – 36): 18 = 13
i) 100 – 3 ( 8+ x) = 1
k) X: 15 + 42 = 15 + 25.8
1) (x + 40).15 = 75.24
m) [( x + 12) – 17]: 5 = 4
n) (x -32) – 15 = 0
i) 456 – (x+23) = 326
Đáp án:
Giải thích các bước giải:
a) X: 13 = 41
⇔X=41 . 13
⇔X=533
b) 1428:x = 14
⇔x=1428:14
⇔x=102
c) 7x -8 = 713
⇔7x=713+8
⇔7x=721
⇔x=721:7
⇔x=103
d) 8( x – 3) = 0
⇔x-3=0
⇔x=0+3
⇔x=3
e) 4x : 17 = 0
⇔4x=0 . 17
⇔4x=0
⇔x=0:4
⇔x=0
f) 0: x = 0
⇔x=0:0
⇔x=0
g) 0.x = 0
⇔x=0:0
⇔x=0
h) 18:6 – x: 2 = 0
⇔3-x :2=0
⇔x : 2=3-0
⇔x:2=3
⇔x=3.2
⇔x=6
1) ( x – 35) – 120 = 0
⇔x-35=0+120
⇔x-35=120
⇔x=120+35
⇔x=155
m) 156 – (x+ 61) = 82
x+61=156-82
⇔x+61=74
⇔x=74-61
⇔x=13
n) 124 + (118 – x) = 217
⇔118 – x =217-124
⇔118 – x=93
⇔x=118-93
⇔x=25
j) ( 567 – x ) + 121 = 64
⇔567-x=64-121
⇔567-x=-57
⇔x=567+57
⇔x=624
a) X- 50: 25 = 8
⇔x-2=8
⇔x=8+2
⇔x=10
b) (x – 50): 25 = 8
⇔x-50=8 .25
⇔x-50=200
⇔x=200+50
⇔x=250
c) X – 105 : 21 = 15
⇔x-5=15
⇔x=15+5
⇔x=20
d) (x – 105): 21 = 15
⇔x-105=15.21
⇔x-105=315
⇔x=315+105
⇔x=420
g) 5X – 36 : 18 = 13
⇔5x-2=13
⇔5x=13+2
⇔5x=15
⇔x=15:5
⇔x=3
h) (5x – 36): 18 = 13
⇔5x-36=13.18
⇔5x-36=234
⇔5x=36+234
⇔5x=270
⇔x=270:5
⇔x=54
i) 100 – 3 ( 8+ x) = 1
⇔3(8+x)=100-1
⇔3.(8+x)=99
⇔8+x=99:3
⇔8+x=33
⇔x=33-8
x=25
k) X: 15 + 42 = 15 + 25.8
⇔x:15+42=15+200
⇔x:15+42=215
⇔x:15=215-42
⇔x:15=173
⇔x=173.15
⇔x=2595
1) (x + 40).15 = 75.24
⇔(x+40).15=1800
⇔x+40=1800:15
⇔x+40=120
⇔x=120-40
⇔x=80
m) [( x + 12) – 17]: 5 = 4
⇔(x+12)-17=4.5
⇔(x+12)-17=20
⇔x+12=20+17
⇔x+12=37
⇔x=37-12
⇔x=25
n) (x -32) – 15 = 0
⇔x-32=0+15
⇔x-32=15
⇔x=15+32
⇔x=47
i) 456 – (x+23) = 326
⇔x+23=456-326
⇔x+23=130
⇔x=130-23
⇔x=107
`a) X: 13 = 41`
`X=41 . 13`
`X=533`
`b) 1428:x = 14`
`x=1428:14`
`x=102`
`c) 7x -8 = 713`
`7x=713+8`
`7x=721`
`x=721:7`
`x=103`
`d) 8( x – 3) = 0`
`x-3=0`
`x=0+3`
`x=3`
`e) 4x : 17 = 0`
`4x=0 . 17
`4x=0`
`x=0:4`
`x=0`
`f) 0: x = 0`
`x=0:0`
`x=0`
`g) 0.x = 0`
`x=0:0`
`x=0`
`h) 18:6 – x: 2 = 0`
`3-x :2=0`
`x : 2=3-0`
`x:2=3`
`x=3.2`
`x=6`
`l) ( x – 35) – 120 = 0`
`x-35=0+120`
`x-35=120`
`x =120+35`
`x =155`
`m) 156 – (x+ 61) = 82`
`x+61=156-82`
`x+61=74`
`x=74-61`
`x=13`
`n) 124 + (118 – x) = 217`
`118 – x =217-124`
`118 – x=93`
`x=118-93`
`x=25`
`j) ( 567 – x ) + 121 = 64`
`567-x=64-121`
`567-x=-57`
`x=567+57`
`x=624`
`X- 50: 25 = 8`
`x-2=8`
`x=8+2`
`x=10`
`b) (x – 50): 25 = 8`
`x-50=8 .25`
`x-50=200`
`x=200+50`
`x=250`
`c) X – 105 : 21 = 15`
`x-5=15`
`x=15+5`
`x=20`
`d) (x – 105): 21 = 15`
`x-105=15.21`
`x-105=315`
`x=315+105`
`x=420`
`g) 5X – 36 : 18 = 13`
`5x-2=13`
`5x=13+2`
`5x=15`
`x=15:5`
`x=3`
`h) (5x – 36): 18 = 13`
`5x-36=13.18`
`5x-36=234`
`5x=36+234`
`5x=270`
`x=270:5`
`x=54`
`i) 100 – 3 ( 8+ x) = 1`
`3(8+x)=100-1`
`3.(8+x)=99`
`8+x=99:3`
`8+x=33`
`x=33-8`
`x=25`
`k) X: 15 + 42 = 15 + 25.8`
`x:15+42=15+200`
`x:15+42=215`
`x:15=215-42`
`x:15=173`
`x=173.15`
`x=2595`
`l) (x + 40).15 = 75.24`
`(x+40).15=1800`
`x+40=1800:15`
`x+40=120`
`x=120-40`
`x=80`
`m) [( x + 12) – 17]: 5 = 4`
`(x+12)-17=4.5`
`(x+12)-17=20`
`x+12=20+17`
`x+12=37`
`x=37-12`
`x=25`
`n) (x -32) – 15 = 0`
`x-32=0+15`
`x-32=15`
`x=15+32`
`x=47`
`i) 456 – (x+23) = 326`
`x+23=456-326`
`x+23=130`
`x=130-23`
`x=107`