|0,3-x|=1/3
x/2 = y/3 = z/4 và x + z = 14
x/0,5 = y/0,3 = z/0,2 và x - y = 1
x/0,3 = y/0,7 = z và z - 3x = 1
0,3*(x*1/3)=1/2*(0,81:2,7)
\(0,3.\left(x.\frac{1}{3}\right)=\frac{1}{2}.\left(0,81:2,7\right)\)
\(0,3.\left(x.\frac{1}{3}\right)=\frac{1}{2}.\frac{3}{10}\)
\(0,3.\left(x.\frac{1}{3}\right)=\frac{3}{20}\)
\(\frac{1}{3}x=\frac{3}{20}:0,3\)
\(\frac{1}{3}x=\frac{1}{2}\)
\(x=\frac{1}{2}:\frac{1}{3}\)
\(x=\frac{3}{2}\)
Vậy x = 3/2
Tìm x: 5/3 × x + 0,3 × x - x - 0,3 - 2 = 0
x(5/3+0,3-1)=0+2+0,3
x.29/30=2,3
x=2,3:29/30
x=69/29
\(1\dfrac{2}{3}:\dfrac{x}{4}=6:0,3\)
\(1\dfrac{2}{3}:\dfrac{x}{4}=6:0,3\)
\(\dfrac{5}{3}:\dfrac{x}{4}=20\)
\(\dfrac{x}{4}=\dfrac{5}{3}:20\)
\(\dfrac{x}{4}=\dfrac{1}{12}\)
\(x=\dfrac{1}{3}\)
1/1/3 : 0,3 = 2/3 : ( 0,1.x)
4/4/9=2/3:[0,1.x]
0,1.x=2/3:4/4/9 [ chuyen ve]
0,1.x=3/20
x=3/20:0,1
x=3/2
tìm x trong tỉ lệ thức: 4 1/3 : x/4 = 6 : 0,3
413 :x4 =60,3
⇒133 :x4 =20
⇒x4 =133 :20
⇒x4 =1360
⇒x=1360 .4
⇒x=1315
<=> 13/3 : x/4 = 20
<=> x/4 = 13/3 : 20 = 13/60
<=> x = 13/60 . 4 = 13/15
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(23 : 4) X 2x +1 =64
Hốn số 4 1/3:x/4= 6 :0,3
Bài 1
A) 3/2+9/2 -6
B) -5/4:(1/4-7/8)+3/2 x(1/3-5/6)
C) (-2,5)x0,65 -1.5 x 0,3+(-0,35)x1,5
a: =6-6=0
b: \(=\dfrac{-5}{4}:\dfrac{2-7}{8}+\dfrac{3}{2}\cdot\dfrac{2-5}{6}\)
\(=\dfrac{-5}{4}\cdot\dfrac{8}{-5}+\dfrac{3}{2}\cdot\dfrac{-3}{6}\)
\(=2+\dfrac{-9}{12}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
c: \(=2,5\cdot\left(-0,65\right)+1,5\left(-0,3-0,35\right)=-0,65\cdot4=-2,6\)
Xác định m để h/s y = 1/3 x3 - (m-1)x2 - (m-3)x +2017m đồng biến trên ( -3, -1) và ( 0,3)