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nhiều quá :((
\(a,2\left(x-5\right)-3\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(-x=45\)
\(x=45\)
\(b,5\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36==12\)
\(3x=48\)
\(x=16\)
\(c,3\left(x-4\right)-\left(8-x\right)=12\)
\(3x-12-8+x=0\)
\(4x-20=0\)
\(4x=20\)
\(x=5\)
Cố nốt nha bn !
cảm ơn, bn nha:)))
mà hình như bạn TOP 3 trả lời câu hỏi pải ko nhỉ???
Tìm x, biết:
a, x/5=2/5
x=2
b, 3/8=6/x
3x=6.8
3x=48
x=16
c, 1/9=x/27
27=9x
x=3
d, 4/x=8/6
4.6=8x
8x=24
x=3
e, 3/x-5=4/x+2
3(x+2)=4(x-5)
3x+6=4x-20
3x-4x=-20-6
-x=-26
x=26
f, x/-2=8/x
x.x=-2.8
x2=-16(vô lí)
a) \(\frac{x}{5}=\frac{2}{5}\Rightarrow5x=10\Rightarrow x=2\)
b) \(\frac{3}{8}=\frac{6}{x}\Rightarrow3x=48\Rightarrow x=16\)
c) \(\frac{1}{9}=\frac{x}{27}\Rightarrow9x=27\Rightarrow x=3\)
d) \(\frac{4}{x}=\frac{8}{6}\Rightarrow24=8x\Rightarrow x=3\)
e) \(\frac{3}{x-5}=\frac{4}{x+2}\Rightarrow3\left(x+2\right)=4\left(x-5\right)\)
\(\Rightarrow3x+6=4x-20\)
\(\Rightarrow20+6=x\)
\(\Rightarrow x=26\)
A. x = 2
B. \(\dfrac{3}{8}=\dfrac{6}{x}\)\(\Leftrightarrow x=\dfrac{6.8}{3}=16\)
C. x = 3
D. \(x=\dfrac{4.6}{8}=3\)
E. \(x=\dfrac{7}{3}\)
G.\(\dfrac{14}{13}=\dfrac{28}{10-x}\)
<=>\(14\left(10-x\right)=364\)
<=> 10 - x = 26
<=> x = -16
H. \(3\left(x+2\right)=4\left(x-5\right)\)
<=> 3x + 6 = 4x - 20
<=> -x = -26
<=> x = 26
K. \(\dfrac{x}{2}=\dfrac{8}{x}\)
<=> \(x^2=16\)
<=> \(\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\)
M. \(\left(x-2\right)^2=100\)
<=> \(\left[{}\begin{matrix}x-2=10\\x-2=-10\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=12\\x=-8\end{matrix}\right.\)
a=2
b=16
c=3
d=3
mik chỉ biết thế này thôi(ko chắc đúng=3)
a, 410. 230=220.230=250
b,925.274.813= 350.312.312=374
Tương tự các câu khác....
a, 410.230 = (22)10.230 = 220.230 = 250
b, 925.274.813 = (32)25.(33)4.(34)3 = 350.312.312 = 374
c, 2550.1255 = (52)50.(53)5 = 5100.515 = 5115
d, 643.48.164 = (26)3.(22)8.(24)4 = 218.216.216 = 250
e, 38 : 36 = 32
210 : 83 = 210 : (23)3 = 210 : 29 = 2
127 : 67 = (12 : 6)7 = 27
@Dương Tuyết Mai
a) 2(4x-8)-7(3+x)=|-4|.(3-2)
8x-16-21-7x=4
8x-7x=4+16+21
x=41
Vậy x=41
b) 8(x-|-7|)-6(x-2)=|-8|.6-50
8x-56-6x+12=8.6-50
8x-6x=48-50+56-12
2x=42
x=42:2
x=21
Vậy x=21
c) -7(5-x)-2(x-10)=15
-35+7x-2x+20=15
7x-2x=15+35-20
5x=30
x=30:5
x=6
Vậy x=6
d) 4(x-1)-3(x-2)=-|-5|
4x-4-3x+6=-5
4x-3x=-5+4-6
x=-7
Vậy x=-7
e) -4(x+1)+(89x-3)=24
-4x-4+89x-3=24
-4x+89x=24+4+3
85x=31
x=31/85
f) 5(x-30)-2(x+6)=9
5x-150-2x-12=9
5x-2x=9+150+12
3x=171
x=171:3
x=57
Vậy x=57
g) -3(x-5)+6(x+2)=9
-3x+15+6x+12=9
-3x+6x=9-15-12
3x=-18
x=-18:3
x=-6
Vậy x=-6
h) 7(x-9)-5(6-x)=-6+11x
7x-63-30+5x=-6+11x
7x+5x-11x=-6+62+30
x=86
Vậy x=86
k) 10(x-7)-8(x+5)=6.(-5)+24
10x-70-8x-40=-30+24
10x-8x=-30+24+70+40
2x=104
x=104:2
x=52
Vậy x=52
a)\(\frac{x}{5}=\frac{-2}{5}\)
\(\Leftrightarrow x=-2\)
b)\(\frac{3}{8}=\frac{6}{x}\)
\(\Leftrightarrow3x=6.8\)
\(\Leftrightarrow3x=48\)
\(\Leftrightarrow x=16\)
c)\(\frac{1}{9}=\frac{-x}{27}\)
\(\Leftrightarrow-9x=27\)
\(\Leftrightarrow x=-3\)
d) \(\frac{x}{-2}=\frac{-8}{x}\)
\(\Leftrightarrow x^2=-2.\left(-8\right)\)
\(\Leftrightarrow x^2=16\)
\(\Leftrightarrow\orbr{\begin{cases}x=4\\x=-4\end{cases}}\)
#H
a) x/5 = 2/5
x.5 = 2.5
5x = 10
x = 2
Vậy x = 2
b) 3/8 = 6/x
3.x = 6.8
3x = 48
x = 16
Vậy x = 16
c) 1/9 = x/27
9x = 27
x = 3
Vậy x = 3
d) 4/x = 8/6
8x = 4.6
8x = 24
x = 3
Vậy x = 3
e) 3/x - 5 = -4/x + 2
3. ( x + 2 ) = ( x - 5 ). ( -4 )
3x + 6 = - 4x - ( -20 )
3x + 6 = - 4x + 20
3x + 4x =20 - 6
x . ( 3 + 4 ) = 14
x . 7 = 14
x = 2
Vậy x = 2
f) X/-2 = -8/X
\(X^2\) = ( -2 ). ( -8 )
\(X^2\) =16
X\(^2\) = \(4^2\)
X = 4
Vậy x = 4
rễ mà