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a, x . 9,9 + x : 10 = 12,5
\(x.\frac{99}{10}+x.\frac{1}{10}=\frac{25}{2}\)
\(x\left(\frac{99}{10}+\frac{1}{10}\right)=\frac{25}{2}\)
\(x.10=\frac{25}{2}\)
\(x=\frac{25}{2}:10=\frac{25}{2}.\frac{1}{10}=\frac{5}{4}\)
b, \(x:\frac{1}{4}-x=\frac{78}{5}\)
\(x.4-x=\frac{78}{5}\)
\(x\left(4-1\right)=\frac{78}{5}\)
\(x.3=\frac{78}{5}\)
\(x=\frac{78}{5}:3=\frac{78}{5}.\frac{1}{3}=\frac{26}{5}\)
c, \(x:\frac{1}{10}-x:4-x.\frac{3}{4}=\frac{9}{4}\)
\(=x.10-x.\frac{1}{4}-x.\frac{3}{4}=\frac{9}{4}\)
\(x\left(10-\frac{1}{4}-\frac{3}{4}\right)=\frac{9}{4}\)
\(x.9=\frac{9}{4}\)
\(x=\frac{9}{4}:9=\frac{9}{4}.\frac{1}{9}=\frac{1}{4}\)
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a; y \(\times\) 9,1 + y \(\times\) 9,1 = 26,4
y \(\times\) (9,1 + 9,1) = 26,4
y \(\times\) 18,2 = 26,4
y = 26,4 : 18,2
y = 2
b; y \(\times\) 9,9 + y : 10 = 12,5
y \(\times\) 9,9 + y \(\times\) 0,1 = 12,5
y \(\times\) (9,9 + 0,1) = 12,5
y \(\times\) 10 = 12,5
y = 12,5 : 10
y = 1,25
\(x\cdot9,9+x:10=12,5\)
\(x\cdot9,9+x\cdot\frac{1}{10}=12,5\)
\(x\cdot\left(9,9+\frac{1}{10}\right)=12,5\)
\(x\cdot\left(\frac{99}{10}+\frac{1}{10}\right)=12,5\)
\(x\cdot\frac{100}{10}=12,5\)
\(x\cdot10=12,5\)
\(x=12,5:10\)
\(x=1,25\)
Vậy x = 1,25
B) 1,25X 0,25 X4 X8
=( 1,25 X 8 ) X (0,25 X 8 )
= 10 X 1
= 10
C)12,5 x 0,8 x 10
=(12,5 x 0,8)x10
= 100 x 10
=1000
D) 0,025 x 10 x 4
= (0,025x 10)x4
= 0,25 x 4
= 1
CHÚC BN HỌC TỐT !
x+x*0,5+x*0,25+x*1,25 =37,725
x*[0,5+0,25+1,25+1]=37,725
x* 3 =37,725
x=12,575
x + x : 2 + x : 4 + x : 8 = 37, 725
<=> x + x . 0,5 + x . 0 ,25 + x . 0 ,125 = 37,725
<=> x( 1 + 0, 5 + 0 ,25 + 0 ,125 ) = 37,725
<=> 1,875x = 37 , 725
<=> x = 20,12
a)X.9,1+X.1,9=26,4 b)X.9,9+X:10=12,5
=>X.(9,1+1,9)=26,4 =>X.9,9+X.0,1=12,5
=>X.11=26,4 =>X.(9,9+0,1)=12,5
=>X=26,4:11 =>X.10=12,5
=>X=2,4. =>X=12,5:10
Vậy X=2,4 =>X=1,25.
Vậy X=1,25
a, X x 9,9 + X : 10 = 12,5
X x 9,9 + X x 0,1 = 12,5
X x (9,9 + 0,1) = 12,5
X x 10 = 12,5
X = 12,5 : 10 = 1,25
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X + X : 2 + X : 4 + X : 8 = 37,725
X : (1 + 2 + 4 + 8) = 37,725
X : 15 = 37,725
X = 37,725 x 15 = 565,875
a; \(x\) \(\times\) 9,9 + \(x\) : 10 = 12,5
\(x\) \(\times\) 9,9 + \(x\) \(\times\) 0,1 = 12,5
\(x\) \(\times\) (9,9 + 0,1) = 12,5
\(x\) \(\times\) 10 = 12,5
\(x\) = 12,5 : 10
\(x\) = 1,25
b; \(x\) + \(x\) : 2 + \(x\) : 4 + \(x\) : 8 = 37,725
\(x\) \(\times\) 1 + \(x\) \(\times\) \(\dfrac{1}{2}\) + \(x\) \(\times\) \(\dfrac{1}{4}\) + \(x\) \(\times\) \(\dfrac{1}{8}\)= 37,725
\(x\) \(\times\)(1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\)) = 37,725
\(x\) \(\times\) \(\dfrac{15}{8}\) = 37,725
\(x\) = 37,725 : \(\dfrac{15}{8}\)
\(x\) = 20,12