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a) \(\left(x-1\right)^2=49\)
\(\Rightarrow\left(x-1\right)^2=7^2=\left(-7\right)^2\)
\(\Rightarrow x-1=7\) hoặc \(x-1=-7\)
\(x=7+1=8\) \(x=-7+1=-6\)
Vậy x = 8 hoặc x = - 6
b) \(3\cdot\left(13-x\right)^2=27\)
\(\left(13-x\right)^2=27\div3=9\)
\(\Rightarrow\left(13-x\right)^2=3^2=\left(-3\right)^2\)
\(\Rightarrow13-x=3\) hoặc \(13-x=-3\)
\(x=13-3=10\) \(x=13+3=16\)
Vậy x = 10 hoặc x = 16
c) \(164-\left(15-x\right)^3=100\)
\(\left(15-x\right)^3=164-100=64\)
\(\Rightarrow\left(15-x\right)^3=4^3\)
\(\Rightarrow15-x=4\)
\(x=15-4=11\)
Vậy x = 11
d) \(\left(x+3\right)^3-15=210\)
\(\left(x+3\right)^3=210+15=225\)
\(\Rightarrow\left(x+3\right)^3=...\)
Tương tự mũ lẻ cậu nhé
e) \(x^2\div4=16\)
\(x^2=16\cdot4=64\)
\(\Rightarrow x^2=8^2=\left(-8\right)^2\)
Vậy x = 8 hoặc x = - 8
a/\(\left(x-1\right)^2\)=49
\(\left(x-1\right)^2\)=\(7^2\)
=>x-1=7
x=7+1
x=8
b/3.\(\left(13-x\right)^2\)=27
\(\left(13-x\right)^2\)=27:3
\(\left(13-x\right)^2\)=9
\(\left(13-x\right)^2\)=\(3^2\)
=>13-x=3
x=13-3
x=10
c/164-\(\left(15-x\right)^3\)=100
\(\left(15-x\right)^3\)=164-100
\(\left(15-x\right)^3\)=64
\(\left(15-x\right)^3\)=\(4^3\)
=>15-x=4
x=15-4
x=11
d/\(\left(x+3\right)^3\)-15=210
\(\left(x+3\right)^3\)=210+15
\(\left(x+3\right)^3\)=225
sai đề bài câu d hay sao ý bạn ạ
chỉ có \(\left(x+3\right)^2\)thì mới tính được
e/\(x^2\):4=16
\(x^2\)=16.4
\(x^2\)=64
\(x^2\)=\(8^2\)
=>x=8
Đề bài bạn 3 câu sai nha !
\(a,\text{ }3^x=34\)
\(\Rightarrow\text{ }x\in\varnothing\)
\(b,\text{ }2^{2x-3}=29\)
\(\Rightarrow\text{ }x\in\varnothing\)
\(c,\text{ }2^x=64\)
\(2^x=2^6\)
\(\Rightarrow\text{ }x=6\)
\(d,\text{ }x^2=16\)
\(x^2=\left(\pm4\right)^2\)
\(x=\pm4\)
\(e,\text{ }15^x=34\)
\(x\in\varnothing\)
Bạn viết nhầm đề à ?
\(a,\text{ }3^x=34\)
\(\Rightarrow\text{ }x\in\varnothing\)
\(b,\text{ }2^{2x-3}=29\)
\(\Rightarrow\text{ }x\in\varnothing\)
\(c,\text{ }2^x=64\)
\(2^x=2^6\)
\(\Rightarrow\text{ }x=6\)
\(d,\text{ }x^2=16\)
\(x^2=\left(\pm4\right)^2\)
\(x=\pm4\)
\(e,\text{ }15^x=34\)
\(x\in\varnothing\)
Bài 1:
29.(85-47)+85.(47-29)
=29.38+85.18
=1102+1530
=2632
BÀI 2
a, 15x = -75
x =( -75) : 15
x = -5
Vậy x= -5
b,-5x+8=-27
-5x = -27 - 8
-5x= -35
x =-35 : -5
x = 7
Vậy x = 7
c,3.(17 + x ) = - 42
17 + x = - 42 : 3
17 + x = -14
x = - 14 - 17
x = -31
Vậy x = - 31
d,-10 -( 2x -16) = 0
2x - 16 = 10-0
2x - 16 = 10
2x = 10 +16
2x = 26
x = 26 : 2
x = 13
Vậy x = 13
e,( mik ko bít làm)
f,( tự làm nghen bạn)
1,a, 33-13(-18)=33-(-234)=267
b, 160.53+47.160=160.(53+47)=160.100=16000
c, 180:{150:[100:(24.2-42.3)]}
=180:{150:[100:(24.2-16.3)]}
=180:{150:[100:(48-48)]}
=180:[150:(100:0)] (loại vì ko có stn nào nhân vs 0 = 100)
d,43-23+(-11)=10+(-11)=-1
e,120.64+36.120=120.(64+36)=120.100=12000
g, 15.{72:[100-(12+45:42)]}
=15.{72:[100-(12+43)]}
=15.{72:[100-(12+64)]}
=15.[72:(100-76)]
=15.(72:24)
=15.3=45
2,a, x-36=82
x=82+36=118
b, (2x+4).8-40=24
(2x+4).8=24+40
(2x+4).8=64
2x+4=64:8
2x+4=8
2x=8-4
2x=4
x=4:2=2
c, (2x+42)-25=64:24
(2x+16)-32=64:16
(2x+16)-32=4
2x+16=4+32
2x+16=36
2x=36-16
2x=20
x=20:2=10
d, 95-x=45
x=95-45=50
e, (2x+13)-2=47-17
(2x+13)-2=30
2x+13=30+2
2x+13=32
2x=32-13
2x=19
x=19:2=9,5
g, (2x+32)-8=50:2
(2x+9)-8=25
2x+9=25+8
2x+9=33
2x=33-9
2x=24
x=24:2=12
b: =>12-x=-7
hay x=19