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9.75.y-y+y.1.25=2,5.1,5
y. (9,75-1+1,25)=3,75
y.10=3,75
y=3,75:10
y=0,375
\(\frac{1}{3}\cdot y+2=\frac{1}{5}\cdot y+\frac{7}{2}\)
\(=>\frac{1}{3}\cdot y-\frac{1}{5}\cdot y=\frac{7}{2}-2\)
\(=>y\cdot\left(\frac{1}{3}-\frac{1}{5}\right)=\frac{3}{2}\)
\(=>y\cdot\frac{2}{15}=\frac{3}{2}\)
\(=>y=\frac{3}{2}:\frac{2}{15}=\frac{45}{4}\)
theo de bai ta co 1/3.y+2=1/5.y+7/2
=>y/3+2=y/5+7/2
=>y+6/3=2y+35/10
=>6y+105=10y+60
=>16y=165
=>y=165/16
y x 326,63 + 245,37 x y = 429
y x ( 326,63 + 245,37 ) = 429
y x 572 = 429
y = 429 : 572
y = 0,75
\(y\cdot326,63+245.37\cdot y=429\)
\(y\cdot\left(326,63+245,37\right)=429\)
\(y\cdot572=429\)
\(y=429:572=\frac{3}{4}\)
\(y\times9,6+y:2,5=45\\ \Rightarrow y\times\dfrac{48}{5}+y:\dfrac{5}{2}=45\\ \Rightarrow y\times\dfrac{48}{5}+y\times\dfrac{2}{5}=45\\ \Rightarrow y\times\left(\dfrac{48}{5}+\dfrac{2}{5}\right)=45\\ \Rightarrow y\times10=45\\ \Rightarrow y=45:10\\ \Rightarrow y=4,5\)
\(a)y\times3+y\times12,5=825\)
\(\Rightarrow y\times\left(3+12,5\right)=825\)
\(\Rightarrow y\times15,5=825\)
\(\Rightarrow y=825:15,5\)
\(\Rightarrow y=5\frac{10}{31}\)
\(b)y\times3+y:0,5=12,85\)
\(\Rightarrow y\times3+y:\frac{1}{2}=12,85\)
\(\Rightarrow y\times3+y\times2=12,85\)
\(\Rightarrow y\times\left(3+2\right)=12,85\)
\(\Rightarrow y\times5=12,85\)
\(\Rightarrow y=12,85:5\)
\(\Rightarrow y=2,57\)