tim x va y
5/x+y/4=1/8
giup dum
tim y va x biet x,y * xy,x =xy,xy va 1,01 * yx =7x,y5
11/8−3/8×x=1/8
giup mik luon voi
\(\dfrac{11}{8}-\dfrac{3}{8}\cdot x=\dfrac{1}{8}\)
\(\dfrac{3}{8}\cdot x=\dfrac{11}{8}-\dfrac{1}{8}\)
\(\dfrac{3}{8}\cdot x=\dfrac{5}{4}\)
\(x=\dfrac{5}{4}:\dfrac{3}{8}\)
\(x=\dfrac{10}{3}\)
\(\dfrac{3}{8}x=\dfrac{11}{8}-\dfrac{1}{8}=\dfrac{10}{8}=\dfrac{5}{4}\)
\(x=\dfrac{5}{4}:\dfrac{3}{8}=\dfrac{5}{4}.\dfrac{8}{3}=\dfrac{10}{3}\)
` 11/8 - 3/8 . x = 1/8 <=> 2/8 . x = 11/8 - 1/8 <=> 2/8x = 10/8 <=> x = 10/8 : 2/8 <=> x = 5 `
x,y*xy,x=xy,xy
1,01×xy=7x,y5
tim x va y
a/ x,y * xy,x = xy,xy => 10*10*x,y *xy,x = 100*xy,xy
=> xy * xyx = xyxy = xy *101 => xyx = 101
b/
=> 101 * xy = 7xy5 => xyxy = 7xy5 = 7005 + 10* xy
=> 91*xy = 7005 => xy = 7005:91=
tim x nguyen biet /x-1/^2+(x-1)^2=2015./x-1/
tim x
giup dum
1,tim cac so nguyen x,y biet: -2/x=y/3 va x<0<y
2, Tim cac so nguyen x,y biet:x-3/y-2=3/2 va x-y=4
-2/x=y/3
=> -2.3 = xy
xy= -6
Mà x>0>y => x là số nguyên âm còn y là số nguyên dương
Lập bảng ( cái này bn tự lâp)
=> Các cặp số nguyên x,y là: x=-2,y=3 ; x= -3,y=2; x=-1,y=6 ; x=-6,y= 1
Do x-y = 4 => x= 4+y
thjays x=4+y vào x-3/y-2=3/2, có:
x-3/y-2=3/2 = 4+y-3/y-2 = 3/2 = y+1/y-2=3/2
=> 2(y+1)= 3(y-2)
2y+2 = 3y-6
3y-2y = 2+6
y=8
thay y= 8 vào x=4+y, có:
x= 4+ 8 = 12
vạy x=12; y=8
tim x va y biet 1/√x+1/√y=4-√x-√y
cho x+y=2x^5
va x^4+x^2y^2+y^4=xy(x^2+y^2)+1 tim x va y
tim x va y biet
1. x/3=y/4 va xy=192
\(\frac{x}{3}=\frac{y}{4}\)mà \(xy=192\)
Ta có \(x=3k\)
\(y=4k\)
\(\Rightarrow3k.4k=192\)
\(\Rightarrow12.k^2=192\)
\(\Rightarrow k^2=16\)
\(\Rightarrow k=4\)
\(\Rightarrow x=3k=3.4=12\)
\(\Rightarrow y=4k=4.4=16\)
Vậy \(x=12;y=16\)
nho cac ban giai dum tim x biet (x4+2013)(x4+2014)=0