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* x/7 = -6/21
=> x = -6.7 : 21
=> x = -2
* x/-2 = -8/x
=> x.x = -8.(-2) = 16
=> x^2 = 16
=> x = 4 hoặc x = -4
ta có : 1/y = x/4 - 1/2 = ( x+2)/4 <=> y = 4/(x - 2)
Để x, y nguyên nên ta có : x-2 ϵ Ư(4) = { -1 , 1 ,-2,2-4,4}
x-2=1=>x=3=>y=4
x-2=-1=>x=1=>y=-4
x-2=-2=>x=0=>y=0
x-2=2=>x=4=>y=2
x-2=-4=>x=-2=>y=-1
x-2=4=>x=6=>y=1
vay cac cap so nguyen( x,y) la :(3,4),(1,-4),(0,0),(4,2),(-2,-1),(6,1)
x4
12
1
a) \(\frac{x}{3}-\frac{1}{4}=\frac{-5}{6}\)
\(\Rightarrow\frac{x}{3}=\frac{-5}{6}+\frac{1}{4}\)
\(\Rightarrow\frac{x}{3}=\frac{-7}{12}\)
\(\Rightarrow x=\frac{\left(-7\right).3}{12}\)
\(\Rightarrow x=\frac{-7}{4}\)
Vậy x = \(\frac{-7}{4}\)
b) \(\frac{x+3}{15}=\frac{1}{3}\)
\(\Rightarrow\left(x+3\right).3=15\)
\(\Rightarrow x+3=15:3\)
\(\Rightarrow x+3=5\)
\(\Rightarrow x=5-3\)
\(\Rightarrow x=2\)
Vậy x = 2
c) \(\frac{x-12}{4}=\frac{1}{2}\)
\(\Rightarrow\left(x-12\right).2=4\)
\(\Rightarrow x-12=4:2\)
\(\Rightarrow x-12=2\)
\(\Rightarrow x=2+12\)
\(\Rightarrow x=14\)
Vậy x = 14
d) \(\frac{25}{9}-\frac{12}{13}x=\frac{7}{9}\)
\(\Rightarrow\frac{12}{13}x=\frac{25}{9}-\frac{7}{9}\)
\(\Rightarrow\frac{12}{13}x=2\)
\(\Rightarrow x=2:\frac{12}{13}\)
\(\Rightarrow x=\frac{13}{6}\)
Vậy x = \(\frac{13}{6}\)
_Chúc bạn học tốt_
a)\(\frac{x}{3}-\frac{1}{4}=-\frac{5}{6}\)
\(\frac{x}{3}=-\frac{5}{6}+\frac{1}{4}\)
\(\frac{x}{3}=-\frac{7}{12}\)
\(x=-\frac{7}{12}\times3\)
\(\Rightarrow x=-\frac{7}{4}\)
b) \(\frac{x+3}{15}=\frac{1}{3}\)
\(\frac{x+3}{15\div5}=\frac{1}{3}\)
\(\Rightarrow x=5-3\)
\(\Rightarrow x=2\)
c) \(\frac{x-12}{4}=\frac{1}{2}\)
\(\frac{x-12}{4\div2}=\frac{1}{2}\)
\(x=12+2\)
\(\Rightarrow x=14\)
d) tự làm nhé cũng dễ mà
1.
A=\(\frac{-5x+-5y+-5z}{21}=\frac{-5\left(x+y+z\right)}{21}=\frac{-5}{21}.x+y+z\)
A= -z+z=0
<p style="padding: 10000000000000000px;" class="alert success"></p>
a) x- 3/4=-1/2 b) 2/5:x=-3/4 câu b la 2/5 nhân âm bốn phần ba nha
x=2/5:-3/4
x=-1/2+3/4 x=2/5x -4/3
x=1/4 x= -8/15