5/x = x/ 45
x+1 /12 = 3/ x+1
tim x biet
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Tim x e n biet
12 x ( x - 1 ) = 0
b) 70 - 5 (x - 3 ) =45
a. 12 . (x - 1) = 0
=> x - 1 = 0 : 12
=> x - 1 = 0
=> x = 0 + 1
=> x = 1.
b/ 70 - 5(x - 3) = 45
=> 5(x - 3) = 70 - 45
=> 5(x - 3) = 25
=> x - 3 = 25 :5
=> x - 3 = 5
=> x = 5 + 3
=> x = 8
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X-1=12x0
X-1=0
X=0+1
x=1
b) 5x(X-3)=70-45
5x(X-3)=25
X-3=25:5
X-3=5
X=5+3
X=8
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1) Tim x biet :
a) - 12 (x - 5) + 7 . (3 - x) = 5
b) 30 . (x + 2) - 6 . (x - 5) - 24x = 100
bai 1 tim cac so nguyen x,y biet
a,x/3=7/y b,x/y=-3/11 c,x/y-1=5/-19
bai 2 tim cac so nguyen x,y,z,t biet
12/-6=x/5=-y/3=z/-17=-t/-9
\(a,\frac{x}{3}=\frac{7}{y}\)
\(\Rightarrow x\cdot y=3\cdot7\)
\(\Rightarrow x\cdot y=21\)
\(\Rightarrow x;y\inƯ\left(21\right)=\left\{\pm1;\pm21;\pm3;\pm7\right\}\)
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tim x dua vao quan he uoc boi:tim so tu nhien x sao cho x-1 la uoc cua 12tim so tu nhien x sao cho 2x+1 la uoc cua 28tim so tu nhien x sao cho x+15 la boi cua x+3tim cac so nguyen x,y sao cho (x+1)(y-2)3tim so nguyen x sao cho(x+2).(y-1)2tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180tim so nguyen to x,y biet x+y12 va UCLL (x:y)5tim so tu nhien x,y biet x+y32 va UCLL (x:y)8tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100x150tim so x nho nhat khac 0b biet...
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tim x dua vao quan he uoc boi:
tim so tu nhien x sao cho x-1 la uoc cua 12
tim so tu nhien x sao cho 2x+1 la uoc cua 28
tim so tu nhien x sao cho x+15 la boi cua x+3
tim cac so nguyen x,y sao cho (x+1)(y-2)=3
tim so nguyen x sao cho(x+2).(y-1)=2
tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180
tim so nguyen to x,y biet x+y=12 va UCLL (x:y)=5
tim so tu nhien x,y biet x+y=32 va UCLL (x:y)=8
tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100<x<150
tim so x nho nhat khac 0b biet x chia het cho 24 va 30
40 chia het cho x . 56 chia het cho x va x>6
tim 2 so tu nhien x va y biet 1) (2x+1)x(y-3)=10 2) (x+1)x(2y-5)=143 3) (3x-2)x(2y-3)=1 4) (x+1)x(2y-1)=12
tim x biet 2^(x-1) +5^(x-2) =7/12
tim x biet
\(\frac{-5}{6}-x=\frac{7}{12}+\frac{-1}{3}\)
\(\frac{-5}{6}-x=\frac{7}{12}+\frac{-1}{3}\)
\(\frac{-5}{6}-x=\frac{7}{12}-\frac{4}{12}\)
\(\frac{-5}{6}-x=\frac{1}{4}\)
\(x=\frac{-5}{6}-\frac{1}{4}\)
\(x=\frac{-20}{24}-\frac{6}{24}\)
x=\(\frac{-13}{12}\)
Vậy x=\(\frac{-13}{12}\)
chúc bạn học tốt~
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1 tim cac so nguyen x,y biet x/7=6/21 -5/y=20/28 1/2=x/12 x/8=-28/32 3/y=12/24 3/4=15/y 2 viet 3 phan so bang phan so -10/15
Tim x biet:
1/6 + 1/12 + 1/20 + 1/30 +...+ 1/ x. (x+1) = 1/3