x : 0.25 + x × 6 = 40
870 - x : 11 x 87 = 261 x : 0.25 x 2.3 = 6.9 2 x (y + y ) = 8.16 y x 1.5 + y + y x 7.5 = 59.8 m : 1/6 + m : 0.25 = 152 m : 1/3 + m : 0.25 = 1.4 giải dùm mình gấp nhé
870 - x : 11 x 87 = 261
x : 11 x 87 = 870 - 261
x : 11 x 87 = 609
x : 11 = 609 : 87
x : 11 = 7
x = 7 x 11
x = 77
x : 0.25 x 2.3 = 6.9
x : 0.25 = 6.9 : 2.3
x : 0.25 = 3
x = 3 x 0.25
x = 0.75
2 x (y + y) = 8.16
y + y = 8.16 : 2
y x 2 = 4.08
y = 4.08 : 2
y = 2.04
y x 1.5 + y + y x 7.5 = 59.8
y x (1.5 + 1 + 7.5) = 59.8
y x 10 = 59.8
y = 59.8 : 10
y = 5.98
m : 1/6 + m : 0.25 = 152
m : 1/6 + m : 1/4 = 152
m x 6 + m x 4 = 152
m x (6 + 4) = 152
m x 10 = 152
m = 152 : 10
m = 15.2
m : 1/3 + m : 0.25 = 1.4
m : 1/3 + m : 1/4 = 1.4
m x 3 + m x 4 = 1.4
m x (3 + 4) = 1.4
m x 7 = 1.4
m = 1.4 : 7
m = 0.2
0.25 x 3.6 x 0.4 /6
=(0.25 x 0.4)x(3.6:6)
= 0.1 x 0.6
= 0.06
[vi ko co dau nhan nen thay bang *]
0.25*3.6*0.4/6=0.9*0.4/6=0.36/6=0.06
0,25 X x = 0,75+0.25
x : 1.25=1/4 - 0.25
0.25 * x = 0.75 + 0.25
0,25 X x = 0,75+0,25
0,25 X x = 1
x = 1:0,25
x = 4
x : 1.25 =1/4 - 0,25
x : 1,25 = 0,75
x = 0,75 x 1,25
x = 0,9375
0,25 X x = 0,75+0,25
0,25 X x = 1
x = 1:0,25
x = 4
0,25 x x = 0,75+0,25
0,25x x = 1
x = 1 : 0,25
x = 4
x : 1,25 =\(\frac{1}{4}\) - 0,25
x : 1,25 = \(\frac{1}{4}-\frac{25}{100}\)
x : 1,25 = \(\frac{1}{4}-\frac{1}{4}\)
x : 1,25 = 0
x = 0 x 1,25
x = 0
0,25 x x = 0,75+0,25
0,25x x = 1
x = 1 : 0,25
x = 4
a) \(0,25\times x=0,75+0,25\)
\(0,25\times x=1\)
\(x=1:0,25\)
\(x=4\)
Vậy \(x=4\)
b) \(x:1,25=\frac{1}{4}-0,25\)
\(x:1,25=0,25-0,25\)
\(x:1,25=0\)
\(x=0\times1,25\)
\(x=0\)
Vậy \(x=0\)
c) \(0,25\times x=0,75+0,25\)
\(0,25\times x=1\)
\(x=1:0,25\)
\(x=4\)
Vậy \(x=4\)
Chúc bạn học tốt !!!
x : 0.25 + x nhân 6 = 45.6 ? ko hiểu bài này giải dùm
\(x\div0,25+x\times6=45,6\\ x\times4+x\times6=45,6\\ x\times\left(4+6\right)=45,6\\ x\times10=45,6\\ x=4,56\)
vậy.....
\(x:0.25+x\cdot6=45.6\)
\(\Leftrightarrow4x+6x=45.6\)
\(\Leftrightarrow10x=45.6\)
hay x=4,56
Câu a tự làm nhé
b, \(\frac{2x+3}{24}=\frac{3x-1}{32}\)
\(\Leftrightarrow32(2x+3)=24(3x-1)\)
\(\Leftrightarrow64x+96=72x-24\)
\(\Leftrightarrow64x+96-72x=-24\)
\(\Leftrightarrow96-8x=-24\Leftrightarrow x=15\)
2. a. \(\frac{x}{3}=\frac{y}{4}=\frac{z}{6}\) và x + y + z = 52
Ta có : \(\frac{x}{3}=\frac{y}{4}=\frac{z}{6}=\frac{x+y+z}{3+4+6}=\frac{52}{13}=4\)\((\)áp dụng tính chất dãy tỉ số bằng nhau \()\)
Vậy : \(\hept{\begin{cases}\frac{x}{3}=4\\\frac{y}{4}=4\\\frac{z}{6}=4\end{cases}}\Leftrightarrow\hept{\begin{cases}x=12\\y=16\\z=24\end{cases}}\)
Tim x:
a) 2x-3=1/2
b) /x+1/=0.25
c) 32/2x=2
d) 64/125=(4/5)^x
e) x/6=-9/18
f) -4/x+3=12/-15
g) x+1/2/0.75=3/2/0.25
TÌM X:
a) 2x - 3 = \(\frac{1}{2}\)
2x = \(\frac{1}{2}+3\)
2x = \(\frac{7}{2}\)
x = 2 : \(\frac{7}{2}\)
x = 2 . \(\frac{2}{7}\)
x = \(\frac{4}{7}\)
b) /x+1/ = 0.25
/x+1/ = \(\frac{1}{4}\)
\(\orbr{\begin{cases}x+1=\frac{1}{4}\\x+1=-\frac{1}{4}\end{cases}}\)
\(\orbr{\begin{cases}x=\frac{1}{4}-1\\x=-\frac{1}{4}-1\end{cases}}\)
\(\orbr{\begin{cases}x=-\frac{3}{4}\\x=-\frac{5}{4}\end{cases}}\)
c) 32 : 2x = 2
\(2x=32:2\)
\(2x=16\)
\(x=16:2\)
\(x=8\)
~GOOD STUDY~
a) 2x-3=1/2
=> 2x=1/2+3
=> 2x=7/2
=> x=7/2:2
=> x=7/4
b) |x+1|=0.25
=> \(\orbr{\begin{cases}x+1=0,25\\x+1=-0,25\end{cases}}\)=>\(\orbr{\begin{cases}x=0,25-1\\x=-0,25-1\end{cases}}\)=>\(\orbr{\begin{cases}x=-0,75\\x=-1,25\end{cases}}\)
[ 2.x - 0,6 ] + 0.25 =5\6
[ 2x - 0,6 ] + 0,25 = 5/6
[ 2x - 0,6 ] = 5/6 - 0,25
2x - 0,6 = 7/12
2x = 7/12 + 0,6
2x = 71/60
x = 71/60 : 2
x = 71/120
\(\left(2x-0,6\right)+0,25=\frac{5}{6}\)
\(\left(2x-0,6\right)=\frac{5}{6}-0,25\)
\(2x-0,6=\frac{7}{12}\)
\(2x=\frac{7}{12}+0,6\)
\(2x=\frac{71}{60}\)
\(x=\frac{71}{60}:2\)
\(x=\frac{71}{120}\)
( 2.x - 0,6 ) + 0,25 = 5/6
<=> ( 2.x - 0,6 ) + 1/4 = 5/6
<=> 2.x - 3/5 = 5/6 - 1/4
<=> 2.x - 3/5 = 7/12
<=> 2.x = 7/12 + 3/5
<=> 2.x = 71/60
<=> x = 71/60 : 2
<=> x = 71/120
Vậy x = 71/120
3/2 . x + 3/7 = -4/5
-11/12 . x + 0.25 =5/6
(x - 2)2 =1
(2x - 1)3 = -8
\(\dfrac{3}{2}x+\dfrac{3}{7}=-\dfrac{4}{5}\)
\(\Leftrightarrow\dfrac{3}{2}x=-\dfrac{43}{35}\)
\(\Leftrightarrow x=-\dfrac{86}{105}\)
Vậy \(x=-\dfrac{86}{105}\)
\(-\dfrac{11}{12}x+0,25=\dfrac{5}{6}\)
\(\Leftrightarrow-\dfrac{11}{12}x+\dfrac{1}{4}=\dfrac{5}{6}\)
\(\Leftrightarrow-\dfrac{11}{12}x=\dfrac{7}{12}\)
\(\Leftrightarrow x=-\dfrac{7}{11}\)
Vậy \(x=-\dfrac{7}{11}\)
\(\left(x-2\right)^2=1\)
\(\Leftrightarrow\left(x-2\right)^2-1=0\)
\(\Leftrightarrow\left(x-2-1\right)\left(x-2+1\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-3=0\\x-1=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)
Vậy x = {3; 1}\(\left(2x-1\right)^3=-8\)
\(\Leftrightarrow2x-1=-2\)
\(\Leftrightarrow2x=-1\)
\(\Leftrightarrow x=-\dfrac{1}{2}\)
Vậy \(x=-\dfrac{1}{2}\)
(x - 2)2 = 1
<=>\(\left[{}\begin{matrix}x-2=1\\x-2=-1\end{matrix}\right.< =>\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)
Vậy x = 3; 1
(2x - 1)3 = -8
<=> 2x - 1 = -2
<=> 2x = -1
<=> x = \(\dfrac{-1}{2}\)
Vậy x = \(\dfrac{-1}{2}\)
\(|\) 2,5 - x\(|\) = 1,3
1,6- \(|\)x - 0,2 \(|\)= 0
13x = 169
\(\dfrac{-2}{x}\)=\(\dfrac{-x}{8\dfrac{ }{25}}\)
\(\dfrac{x}{-15}\)=\(\dfrac{-60}{x}\)
\(|\)x\(|\)+0,573=2
x/0.25+x*0.25=3.75