Tìm x :
a/ 7x - 44 : 11 + x = 617 : 615
b/ (x - 3)6 - (x - 3)4 = 0
Bài 1:Tìm x
a) 5x+x=39-3^11:3^9
b) 7x-x=5^21:5^19+3.2^2-7^0
c) 7x-2x =6^17:6^15+44:11
Tìm x
a) 315 + (146 -x ) =401
b) (6x - 39 ) : 3 =201
c) 7x - x = 5 mũ 21 :5 mũ 19 + 3.2 mũ 2 - 70
d) 7x - 2x = 617 : 615 +44 :11
e) 0 :x = 0
f) 3 mũ x = 9
g) 9 mũ x -1 = 9
h) (2x +1 ) mux3 = 125
i) 2 mũ x - 15 =17
k) (7x - 11 )mũ 3 = 25 . 5 mũ 2 +200
l) 3 mũ x + 25 = 26. 2 mũ 2 + 2 . 3 mũ 0
m) 5 .2 mũ x + 4 .2 mũ x = 18 . 2 mũ 5
a) 315 + ( 146 - x ) = 401
<=> 146 - x = 401 - 315
<=> 146 - x = 86
<=> x = 60
Vậy x = 60
a) 5x + x = 39 – 311:39 b) 2x : 25 = 16
| c) 7x – x = 521 : 519 + 3.22 - 70 d) 7x – 2x = 617: 615 + 44 : 11 |
a) \(5x+x=39-3^{11}:3^9\)
\(\Leftrightarrow6x=39-3^2\)
\(\Leftrightarrow6x=30\)
\(\Leftrightarrow x=5\)
b) \(2^x:2^5=16\)
\(\Leftrightarrow2^x:2^5=2^4\)
\(\Leftrightarrow2^x=2^4.2^5\)
\(\Leftrightarrow2^x=2^9\)
\(\Leftrightarrow x=9\)
c) \(7x-x=5^{21}:5^{19}+3.2^2-7^0\)
\(\Leftrightarrow6x=5^2+3.4-1\)
\(\Leftrightarrow6x=36\)
\(\Leftrightarrow x=6\)
d) \(7x-2x=6^{17}:6^{15}+44:11\)
\(\Leftrightarrow5x=6^2+4\)
\(\Leftrightarrow5x=40\)
\(\Leftrightarrow x=8\)
a)⇔6x=39-32
⇔6x=30
⇔ x=5
b)2x:25=16
⇔2x=24.25
⇔ 2x=29
⇔ x=9
c)⇔6x=52+3.22-1
⇔ 6x= 36
⇔ x=6
d)⇔5x=62+4
⇔ 5x=40
⇔ x=8
a) 5x + 3x = 36 : 33.4 + 12
4x + 2x = 68 – 219 : 216
a) 5x + x = 39 – 311:39
b) 7x – x = 521 : 519 + 3.22 - 70
c) 7x – 2x = 617: 615 + 44 : 11
a: \(\Leftrightarrow6x=30\)
hay x=5
b: \(\Leftrightarrow6x=25+12-1=36\)
hay x=6
a) 5x + 3x = 36 : 33.4 + 12
4x + 2x = 68 – 219 : 216
a) 5x + x = 39 – 311:39
b) 7x – x = 521 : 519 + 3.22 - 70
c) 7x – 2x = 617: 615 + 44 : 11
a: \(\Leftrightarrow8x=108+12=120\)
hay x=15
b: \(\Leftrightarrow6x=60\)
hay x=10
a) 5x + 3x = 120
x . (5+3)= 120
x . 8 = 120
x = 120 : 8
x = 15
c) 7x - 2x = 40
x .(7-2)= 40
x . 5 = 40
x = 40 : 5
x = 8
a, ( x - 2 )² - 11 = 25
b, 3 . | x - 4 | - 12 = 6
c, 7x³ - 12 = 44
d, ( x - 7 ) . ( x + 2 ) = 0
a) \(\left(x-2\right)^2-11=25\)
\(\left(x-2\right)^2=25+11\)
\(\left(x-2\right)^2=36\)
\(\left(x-2\right)^2=6^2\)
\(\Rightarrow x-2=6\)
\(\Rightarrow x=8\)
vậy \(x=8\)
những câu khác làm tương tự
học vui truong the dat
a, \(\left(x-2\right)^2-11=25\)
\(\Rightarrow\left(x-2\right)^2=25+11\)
\(\Rightarrow\left(x-2\right)^2=36\)
\(\Rightarrow\left(x-2\right)^2=6^2=\left(-6\right)^2\)
\(\Rightarrow x-2=6\)hoặc \(x-2=-6\)
\(\Rightarrow x\in\left\{8;-4\right\}\)
a) (x-2)2-11=25
=>(x-2)2=25+11=36
=>x-2=6
=>x=6+2=8
b)=> 3.(x-4)-12=6 (Khi x-4 lớn hơn hoặc bằng 0)
hoặc 3.(4-x)-12=6 (Khi x-4 nhỏ hơn 0)
=> 3x-12-12=6
hoặc 12-3x-12=6
=>3x=6+12+12=30
hoặc -3x=6
=>x=10 hoặc =2
c)7x3-12=44
=>7x3=44+12=56
=>x3=8
=>x=2
d)(x-7)(x+2)=0
=> x-7=0 hoặc x+2=0
=>x=7 hoặc x=-2
tìm x, biết:
a, 5x + x = 39-311:39
b, 7x - x = 521:519+3.22-70
c, 7x - 2x = 617:615+44:11
a) \(5x+x=39-3^{11}:3^9\)
\(6x=39-3^2\)
\(x=30:6\)
\(x=5\)
vậy \(x=5\)
b) \(7x-x=5^{21}:5^{19}+3.2^2-7^0\)
\(6x=5^2+12-1\)
\(6x=36\)
\(x=6\)
vậy \(x=6\)
câu c tương tự nha
a ) 5 x + x = 3 9 − 3^11:3^9
6 x = 39 − 3^2
x = 30:6
x = 5
vậy x = 5
b ) 7 x − x = 5^21:51^9 + 3.2^2 − 7^0
6 x = 5^2 + 1 2 − 1
6 x = 36
x = 6
v ậ y x = 6
câu C làm tương tự nha bn @!!!!!!
Tìm x
x - 4/5 = 3/7
x + 3/7 = 4/5
19/20 - x = 8/5 - 3/4
4/5 x X = 6/9 - 4/7
x : 7/9 = 6/8
2/3 - x/6 = 6/18
a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=2/21
=>x=2/21:4/5=5/42
e: =>x:7/9=6/8
=>x=6/8*7/9=3/4*7/9=21/36=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2
Tìm x
x - 4/5 = 3/7
x + 3/7 = 4/5
19/20 - x = 8/5 - 3/4
4/5 x X = 6/9 - 4/7
x : 7/9 = 6/8
2/3 - x/6 = 6/18
a: x-4/5=3/7
=>x=3/7+4/5=43/35
b: x+3/7=4/5
=>x=4/5-3/7=13/35
c: 19/20-x=8/5-3/4
=>19/20-x=32/20-15/20=17/20
=>x=2/20=1/10
d: =>4/5*x=11/21
=>x=55/84
e: =>x=6/8*7/9=42/72=7/12
f: =>x/6=2/3-1/3=1/3
=>x=2