(x-3).(y-5)=7
ta có 7=1.7 =>có 2 th
TH1:X-3=1=>X=1+3=>X=4
Y-5=7=>Y=5+7=>Y=12
TH2:x-3=7=>x=7+3=>x=10
y-5=1=>y=1+5=>y=6
xong rùi đó **** mình nha
Lan Anh Trần thiếu trường hợp 7 = (-7)(-1) = (-1)(-7)
tim x, y, z
a) x/y=-6/9 va x-y=30
b)x/5=y/4, z/5=y/7 va 2*x+3*y-z=106
c)x/5=y/4=z/7 va x+2*y+z=40
Tim x,y,z biet:
(2|x|+5)/3=(3|y|-1)/5=(3-z)/7 va 2|x|+7|y|+3z=-14
tim x;y;z biet x/3=y/4;y/5=z/7 va x+y+z=98
tim x,y,z khi
\(\frac{x}{7}=\frac{y}{3}va\)x-24=y
\(\frac{x}{5}=\frac{y}{7}=\frac{z}{2}\)va y-x=48
\(\frac{x}{2}=\frac{y}{3};\frac{y}{4}=\frac{z}{5}\)va x-y- z=28
\(\frac{x}{3}=\frac{y}{5}=\frac{z}{7}\)va 2x+3-z=-14
Tim x,y,z biet :x+2/7 =y-3/5 =z/3 va x+y - z = -17
_GIUP_MINH_VOI_NHE_MK_TICK_CHO
Tim hai so x va y ,biet :x÷2=y÷(-5) va x-y=-7
x/3=y/4;y/5=z/7 va x+y+z=98
tim x;y;z
1,tim ba so x,y,z.bt rang:
x/2=y/3,y/4=z/5(dau / la phan)
2,tim 2 so x,ybt:x:2=y:(-5) va x-y=7
nhanh thi tick
Tim cac so x,y,z biet \(\frac{x}{5}=\frac{y}{7}=\frac{z}{3}\)va x2 va y2 va z2
