1468 lượt thi
43 câu hỏi
60 phút
Câu 1:
x+5=8
x=8−5
x=3
Câu 2:
Tìm x, biết:
a)5.22+x+3=52
x+3=52−5.22
x+3=5.5−4
x+3=5
x=2
Câu 3:
Tìm x, biết: b)23+x–32=53−43
b)23+x–32=53−43
x−32=125−64−8
x−9=53
x=62
Câu 4:
Tìm x, biết: c)4x–5–23=24.3
c)4x–5–23=24.3
4(x−5)=24.3+23
4(x−5)=23(6+1)
4(x−5)=23.7
x−5=23.7:4
x−5=14
x=19
Câu 5:
Tìm x, biết: d)5x+7–10=23.5
d)5x+7–10=23.5
5x+7=23.5+10
5(x+7)=2.5(22+1)
x+7=2.5
Câu 6:
e)72–713–x=14
7.7−13−x=14
7−13−x=2
13−x=7−2
13−x=5
x=8
Câu 7:
f)5x–52=10
5x=10+25
5x=3
x=7
Câu 8:
g)9x–2.32=34
9x−2.32=34
9x=34+2.32
9x=3232+2
x=11
Câu 9:
h)10x+22.5=102
10x=22.52−22.5
10x=2.52.5−2
Câu 10:
i)125–54+x=15
54+x=125−15
54+x=110
4+x=110:5
4+x=22
x=18
Câu 11:
j)26+5+x=34
5+x=81−64
5+x=17
x=12
Câu 12:
a)15:x+2=3
x+2=15:3
x+2=5
x=5−2
Câu 13:
b)20:x+1=2
1+x=20:2
1+x=10
x=10−1
x=9
Câu 14:
Tìm x, biết: c)240:x−5=22.52−20
c)240:x−5=22.52−20
240:x−5=100−20
240:x−5=80
x−5=240:80
x−5=3
Câu 15:
3(x+1)=96−42
3(x+1)=54
x+1=54:3
x+1=18
x=17
Câu 16:
e) 5x+35=515
x+35=515:5
x+35=103
x=103−35
x=68
Câu 17:
Tìm x, biết: f)12x−33=32.33
f)12x−33=32.33
12x=243+33
12x=276
x=23
Câu 18:
g)541−218+x=73
218+x=541−73
218+x=468
x=468−218
x=250
Câu 19:
h)1230:3x−20=10
3(x−20)=1230:10
3(x−20)=123
x−20=41
x=41+20
x=61
Câu 20:
a)48−3x+5=24
3(x+5)=48−24
3(x+5)=24
x+5=24:3
Câu 21:
b)2x+1−2x=32
2x.2−2x=25
2x=25
x=5
Câu 22:
Tìm x, biết: c)15+x:3=315:312
c)15+x:3=315:312
15+x:3=33
15+x=27.3
15+x=81
x=81−15
x=66
Câu 23:
d)250−1024−3x:15=244
4x+9=13
4x=13−9
4x=4
x=1
Câu 24:
2x−1=32
2x=9+1
2x=10
Câu 25:
5x−1=525:525
5x−1=1
5x−1=50
x−1=0
Câu 26:
h)x−48:16=37
x−3=37
x=37+3
x=40
Câu 27:
a)8x−12:4.33=36
8x−12:4=36:33
8x−12:4=33
8x−12=27.4
8x−12=108
8x=120
x=15
Câu 28:
Tìm x, biết: b)41−2x+1=9
b)41−2x+1=9
2x+1=41−9
2x+1=32
2x+1=25
x+1=5
x=4
Câu 29:
Tìm x, biết: c)32x−4−x0=8
c)32x−4−x0=8
32x−4−1=8
32x−4=9
32x−4=32
2x−4=2
2x=6
Câu 30:
Tìm x, biết: d)65−4x+2=20140
d)65−4x+2=20140
4x+2=65−1
4x+2=64
4x+2=43
x+2=3
Câu 31:
e)120+2.8x−17=214
2(8x−17)=214−120
2(8x−17)=94
8x−17=47
8x=64
Câu 32:
Tìm x biết: f)52x–3–2.52=52.3
f)52x–3–2.52=52.3
52x−3=52.3+2.52
52x−3=53
2x−3=3
Câu 33:
g)30−4x−2+15=3
4x−2+15=30−3
4x−2+15=27
4x−2=27−15
4x−2=12
x−2=3
Câu 34:
Tìm x biết : h)740:x+10=102–2.13
h)740:x+10=102–2.13
740:x+10=100−26
740:x+10=74
x+10=740:74
x+10=10
x=0
Câu 35:
Tìm x, biết 19x+2.52:14=13−82−42
19x+2.52:14=13−82−42
19x+2.52:14=52−42
19x+2.52:14=9
19x+2.52=14.9
19x+50=126
19x=126−50
19x=76
Câu 36:
Tìm x, biết 2.3x=10.312+8.274
2.3x=10.312+8.274
2.3x=10.312+8.334
2.3x=10.312+8.312
2.3x=18.312
3x=9.312
3x=32.312
3x=314
x=14
Câu 37:
Tìm x, biết 2.3x+1−3x=135
2.3x+1−3x=135
2.3x.3−3x=135
3x.5=135
3x=27
3x=33
Câu 38:
Tìm x, biết 15:x+2=33+3:10
15:x+2=33+3:10
15:x+2=30:10
15:x+2=3
Câu 39:
4.3x−13−52=475
4.3x−13=475+25
4.3x−13=500
3x−13=125
3x−13=53
3x−1=5
Câu 40:
Tìm x thuộc N, biết:
2x+2x+1=96;
2x+2x.2=96
2x.3=96
2x=32
Câu 41:
38x+4=81x+3
34(2x+1)=81x+3
812x+1=81x+3
2x+1=x+3
Câu 42:
x2015=x2016
x2015=x2015.x
x2015.x−x2015=0
x2015x−1=0
x2015=0x−1=0⇒x=0x=1
Câu 43:
4x−13=27.125
4x−13=33.53
4x−13=153
4x−1=15
4x=16
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