1)111/37<x<91/13
\(\Leftrightarrow\)\(\frac{1443}{481}\)<x<\(\frac{3367}{481}\)
vậy x\(\in\)\(\left\{\frac{1444}{481};......;\frac{3366}{481}\right\}\)
2)-84/14<x<108/9
\(\Leftrightarrow\)\(\frac{-801}{126}\)<x<\(\frac{432}{126}\)
vậy x\(\in\)\(\left\{\frac{-800}{126};.......;\frac{431}{126}\right\}\)
3)\(\frac{-x}{4}\)=\(\frac{-9}{x}\)\(\Rightarrow\)-x.x=(-x)2=4.(-9)=-36
\(\Rightarrow\)(-x)2=-36=(-6)2
vậy -x=6;x=6
5)(x+7+1) chia hết cho (x+7)
6)(x+8) chia hết (x+7)
7(2x+14+2) chia hết (x+7)
8(2x+16) chia hết (x+7)
9) (x-5+1) chia hết (x-5)
10) (2x-9) chia hết (x-5)
tim x
a,3/8=6/x ; b,1/9=x/27
c,4/x=8/6 ; d,3/x-5=-4/x+2
Tìm x thuộc Z, biết: x/-4=-9/x
Tìm x:
-x/9 = -4/x
Bài 1: Tìm x, biết:
a,\(\dfrac{x}{-7}\)= 14249
b, \(\dfrac{2}{x}\)=\(\dfrac{y}{35}\)=\(\dfrac{-36}{84}\)
c, \(\dfrac{4}{x}\)=\(\dfrac{y}{21}\)=\(\dfrac{7}{49}\)=\(\dfrac{52}{91}\)
d,\(\dfrac{7}{x}\)=\(\dfrac{y}{27}\)=\(\dfrac{-42}{54}\)
Tìm số nguyên x
-4/x=x/-9
3/x-5=2x/-12
tìm các số nguyên x,y biết 1/8<x/12<y/9<1/4
x.2-4=9
(dau . nay la nhan nhe)