tim x biet:
0,5 x [0,5 x (x- 0,5)-0,5]=0,5
tim x biet:0.5*[0,5*(x-0,5)-0,5]=0,5
0,5[0,5(x-0,5)-0,5]=0,5
0,5(x-0,5)-0,5=0,5:0,5
0,5(x-0,5)-0,5=1
0,5(x-0,5)=1+0,5
0,5(x-0,5)=1,5
x-0,5=1,5:0,5
x-0,5=3
x=3+0,5
x=3,5
Vậy x = 3,5
<=> 0.5 *(x-0.5)-0.5 = 1
<=> 0.5 * (x-0.5) = 1.5
<=> x-0.5 = 3
<=> x=3.5
\(0,5\times\left[0,5\times\left(x-0,5\right)-0,5\right]=0,5.\)
\(\Leftrightarrow0,5\times\left(x-0,5\right)-0,5=1\)
\(\Leftrightarrow0,5\times\left(x-0,5\right)=1,5\)
\(\Leftrightarrow x-0,5=3\)
\(\Leftrightarrow x=3,5\)
tim x biet :x/0,5+x*0,5=0,75
x/0.5+x*0.5=0.75
x*2+x*0.5=0.75
x*(2+0.5)=0.75
x*2.5=0.75
x=0.75/2.5
x=0.3
\(\frac{x}{0,5}\)+ \(x\)x 0,5 = 0,75
\(x\): 0,5 + \(x\)x 0,5 = 0,75
\(x\)x 2 + \(x\)x 0,5 = 0,75
\(x\)x (2 + 0,5) = 0,75
\(x\)x 2,5 = 0,75
=> \(x\)= 0,75 : 2,5 = 0,3
tim x biet x+x :0,5+x:0,25+x:0,125
nhanh nhe minh k cho ai lam nhanh nhat
tim x biet:
14 - (1,18 x X + 3,2) : 2=6,5
X x4,8 + X : 5 = 6,4
( X + 1) + (X + 4)+ (X + 7)+.....+(X+ 28 )=155
X x 1,8 -435 = X x 0,3 + 1620
X + X : 0,5 + X : 0,25 + X : 0,125 = 15
12 x(3,75-0,23 : X - 0,5) = 3,6
7,75 - (0,5 x X : 5 - 6,2) = 5
tim x . biet : x - 0,5 =1/3 + 1/4
x - 0,5 = 1/3+1/4
=> x - 1/2 =1/3 +1/4
=>x - 6/12= 7/12
=>x = 13/12
Tim x biet :
a)X+X:0,5+X:0,25+X:0,125=15
a,
\(x+x:0,5+x:0,25+x:0,125=15\\ x+x:\dfrac{1}{2}+x:\dfrac{1}{4}+x:\dfrac{1}{8}=15\\ x+2x+4x+8x=15\\ x\left(1+2+4+8\right)=15\\ 15x=15\\ x=1\)
tim x biet : x:0,25+x:0,5+x+x:0,01=321
X : 0,25 + X : 0,5 + X + X : 0,01 = 321
X x 4 + X x 2 + X x 1 + X x 100 = 321
X x ( 4 + 2 + 1 + 100 ) = 321
X x 107 = 321
X = 321 : 107
X = 3
Tim X
a/|X+2| - |X+7|=0
b/|2X-1| = 2X-1
c/| 0,5-3X | = 3X-0,5
d/| 5X+1| - 10X = 0,5
Tim x ,biet:
4/7:x+5/6=0,5
\(\frac{4}{7}:x=0,5-\frac{5}{6}=\frac{1}{2}-\frac{5}{6}=\frac{-1}{3}\)
\(x=\frac{4}{7}:\frac{-1}{3}=\frac{-12}{7}\)
4/7 : x + 5/6 = 0,5
4/7 : x + 5/6 = 1/2
4/7 : x = 1/2 - 5/6
4/7 : x = 3/6 : 5/6
4/7 : x = 3/6 . 6/5
4/7 : x = 3/5
x = 4/7 : 3/5
x = 4/7 . 5/3
x = 20/21
Vậy....
@Cothanhkhe
\(\frac{4}{7}:x+\frac{5}{6}=0,5\)
\(\frac{4}{7}:x+\frac{5}{6}=\frac{1}{2}\)
\(\frac{4}{7}:x=\frac{1}{2}-\frac{5}{6}=\frac{3}{6}-\frac{5}{6}\)
\(\frac{4}{7}:x=\frac{-1}{3}\)
\(x=\frac{4}{7}:\frac{-1}{3}\)
\(x=\frac{4}{7}.\frac{-3}{1}\)
\(x=\frac{-12}{7}\)