tim x: 14.x-x-1=9
tim x 9/14-x/7:5/3=3/14
\(\frac{9}{14}-\frac{x}{7}:\frac{5}{3}=\frac{3}{14}\Leftrightarrow\frac{9}{14}-\frac{3x}{35}=\frac{3}{14}\Leftrightarrow\frac{3x}{35}=\frac{3}{7}\Leftrightarrow3x=15\Leftrightarrow x=5\)
9/14 - x/7 : 5/3 = 3/14 tim x
9/14-x/7:5/3=6/14
x/7:5/3=3/14
x/7=5/14
x=35/7
tim x;y thuoc Z
x+1/3=y-z/5=2x+14/9 và x+z =y
Tim x,y,z:
x+1/3=y-z/5=2x+14/9 và x+z=y
bai 1)tim x biet
a )24-(36+5)=x
b)14-21=(13-x)-(15+8)
bai 2) tim x biet
a)17-x=-25+(-16+9)
b)3x-21=-19-(-2x)
Bài 1: Tìm x, biết
a )24-(36+5)=x b)14-21=(13-x)-(15+8)
24-41=x (13-x)-23=-7
x=-17 13-x=(-7)+23
Vậy x=-17 13-x=16
x=13-16
x=-3 Vậy x=-3
Bài 2:Tìm x, biết
a)17-x=-25+(-16+9) b)3x-21=-19-(-2x)
17-x=-25+(-7) 3x-21=-19+2x
17-x=-32 3x-2x=-19+21
x=17-(-32) x=4
x=49 Vậy x=4
Vậy x=49
Bài 1:
a. 24 - (36+5) = x
=> 24 - 41 = x
=> -17 = x
=> x = -17
b. 14 - 21 = (13 - x) - (15 + 8)
=> -7 = 13 - x - 23
=> -7 - 13 + 23 = -x
=> 3 = -x
=> x = -3
Bài 2:
a. 17 - x = -25 + (-16 + 9)
=> 17 - x = -25 + (-7)
=> 17 - x = -32
=> 17 + 32 = x
=> x = 49
b. 3x - 21 = -19 - (-2x)
=> 3x - 21 = -19 + 2x
=> 3x - 2x = -19 + 21
=> x = 2
Bài1
a)24-(36+5)=x\(\Rightarrow\)x=24-41=-17
b)14-21=(13-x)-(15+8)\(\Rightarrow\)(13-x)-(15+8)=-7\(\Rightarrow\)13-x=-7+23=16\(\Rightarrow\)x=13-16=-3
Bài2
a)17-x=-25+(-16+9)\(\Rightarrow\)17-x=-25+-7\(\Rightarrow\)17-x=-32\(\Rightarrow\)x=17-(-32)=17+32=49
b)3x-21=-19-(-2x)\(\Rightarrow\)3x-(-2x)=-19-21\(\Rightarrow\)3x+2x=-40\(\Rightarrow\)5x=-40\(\Rightarrow\)x=-8
-84/14 < x < 108/9 tim x
\(\frac{-84}{14}< x< \frac{108}{9}\)
\(\Rightarrow\frac{-156}{126}< x< \frac{1456}{126}\)
\(\Rightarrow x\in\left\{\frac{-155}{126};\frac{-154}{126};\frac{-153}{126};...;\frac{1455}{126}\right\}\)
chúc bạn học tốt
tim x;biet
a;x-14=3.x+18
b;|x+3|+|x+9|+|x+5|=4x
\(x-14=3x+18\)
\(\Leftrightarrow\)\(3x-x=-14-18\)
\(\Leftrightarrow\)\(2x=-32\)
\(\Leftrightarrow\)\(x=\frac{-32}{2}\)
\(\Leftrightarrow\)\(x=-16\)
b) Ta có :
\(\left|x+3\right|\ge0\)\(;\)\(\left|x+9\right|\ge0\) và \(\left|x+5\right|\ge0\) nên \(\left|x+3\right|+\left|x+9\right|+\left|x+5\right|\ge0\)
Mà \(\left|x+3\right|+\left|x+9\right|+\left|x+5\right|=4x\) \(\Rightarrow\)\(4x\ge0\)
Vì \(4>0\) nên \(x\ge0\)
\(\Rightarrow\)\(\left|x+3\right|+\left|x+9\right|+\left|x+5\right|=4x\)
\(\Leftrightarrow\)\(x+3+x+9+x+5=4x\)
\(\Leftrightarrow\)\(\left(x+x+x\right)+\left(3+9+5\right)=4x\)
\(\Leftrightarrow\)\(3x+17=4x\)
\(\Leftrightarrow\)\(4x-3x=17\)
\(\Leftrightarrow\)\(x=17\)
Vậy \(x=17\)
\(x-14=3x+18\)
\(x-3x=14+18\)
\(-2x=32\)
\(x=\frac{32}{-2}\)
\(x=-16\)
\(x-14=3x+18\)
\(x-3x=14+18\)
\(-2x=32\)
\(x=32:\left(-2\right)\)
\(x=-16\)
Tim x: 18/5 * x = 9/7:14/5
biet rang 1^2+2^2+3^2+....+10^2=385.Tim x biet x+10^2+12^2+14^2+...+20^2=2011+1^2+3^2+...+9^2