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a ) 1/4 x X x 2 = 15
X x 2 = 1/4 x 15
Xx2=3,75
x= 3,75 : 2
x= 1,875
a) 1/4.x+x=36,5-21,5
1/4.x+x=15
x.(1/4+1)=15
x.5/4 =15
x =15:5/4
x =12
b) 3/5.x+x.2=53-40
3/5.x+x.2=13
x.(3/5+2)=13
x.13/5 =13
x =13:13/5
x =5
\(a.\frac{1}{4}+x+x+21,5=36,5\)
\(0,25+21,5+2x=36,5\)\(\)
\(21,75+2x\) \(=36,5\)
\(2x\) \(=36,5-21,75\)
\(x\) \(=14,72\div2=\frac{59}{8}\)
\(b.\frac{3}{5}\times x+x\times2+40=53\)
\(x\times(\frac{3}{5}+2)\) \(=53-40\)
\(x\times\frac{13}{5}\) \(=13\)
\(x\) \(=13\div\frac{13}{5}\)
\(x\) \(=5\)
Học tốt nhé
a: \(x+\dfrac{3}{9}=\dfrac{7}{6}\cdot\dfrac{2}{3}\)
=>\(x+\dfrac{1}{3}=\dfrac{14}{18}=\dfrac{7}{9}\)
=>\(x=\dfrac{7}{9}-\dfrac{1}{3}=\dfrac{7}{9}-\dfrac{3}{9}=\dfrac{4}{9}\)
b: \(x-\dfrac{2}{3}=\dfrac{1}{8}:\dfrac{5}{4}\)
=>\(x-\dfrac{2}{3}=\dfrac{1}{8}\cdot\dfrac{4}{5}=\dfrac{1}{10}\)
=>\(x=\dfrac{1}{10}+\dfrac{2}{3}=\dfrac{3+20}{30}=\dfrac{23}{30}\)
\(a,30+X=120:5+27\\ 30+X=24+27\\ 30+X=51\\ X=51-30=21\\ ---\\ b,40-3\times X=13\\ 3\times X=40-13=27\\ X=\dfrac{27}{3}=9\\ ---\\ 2\times X-8=16\\ 2\times X=16+8\\ 2\times X=24\\ X=\dfrac{24}{2}=12\\ \\---\\ \dfrac{1}{2}\times X-\dfrac{1}{3}=\dfrac{1}{4}\\ \dfrac{1}{2}\times X=\dfrac{1}{4}+\dfrac{1}{3}=\dfrac{7}{12}\\ X=\dfrac{7}{12}:\dfrac{1}{2}=\dfrac{7}{6}\)
`3/5 xx x +2+40=53`
`=> 3/5 xx x +2=53-40`
`=> 3/5 xx x +2=13`
`=> 3/5 xx x =13-2`
`=> 3/5 xx x=11`
`=> x=11:3/5`
`=>x= 11 xx 5/3`
`=> x= 55/3`
\(\dfrac{3}{5}\times x+2+40=53\\ \rightarrow\dfrac{3}{5}\times x+2=53-40\\ \rightarrow\dfrac{3}{5}\times x+2=13\\ \rightarrow\dfrac{3}{5}\times x=13-2\\ \rightarrow\dfrac{3}{5}\times x=11\\ \rightarrow x=11:\dfrac{3}{5}\\ \rightarrow x=11\times\dfrac{5}{3}\\ \rightarrow x=\dfrac{55}{3}\)
A) 2/3 - x - 1/5 = 2/5 - 1/7
2/3 - x - 1/5 = 9/35
2/3 - x = 9/35 + 1/5
2/3 - x = 16/35
x = 2/3 - 16/35 = 22/105
B) 1/2 x X : 2/3 = 1 2/5
1/2 x X : 2/3 = 7/5
1/2 x X = 7/5 x 2/3
1/2 x X = 14/15
X =14/15 : 1/2
X = 28/15
C) 2/5 x X + X x 1/5 = 2/7
X x ( 2/5 + 1/5 ) = 2/7
X x 3/5 = 2/7
X = 2/7 : 3/5 = 10/21
\(x\times\frac{3}{5}+x:5=\frac{2}{3}\)
\(x\times\frac{3}{5}+x\times\frac{1}{5}=\frac{2}{3}\)
\(\frac{3}{5}x+\frac{1}{5}x=\frac{2}{3}\)
\(\frac{4}{5}x=\frac{2}{3}\)
\(x=\frac{4}{5}:\frac{2}{3}\)
\(x=\frac{6}{5}\)
Phần b tương tự.