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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
25%=25/100=1/4=0,25
X*(9,75+0,25)=48,35
X*10=48,35
X=48,35:10
X=4,835
nhớ k nha
\(x\times9,75+25\%\times x=48,35\)
\(\Leftrightarrow x\times9,75+\frac{25}{100}\times x=48,35\)
\(\Leftrightarrow x\times\left(9,75+\frac{25}{100}\right)=48,35\)
\(\Leftrightarrow x\times\left(9,75+0,25\right)=48,35\)
\(\Leftrightarrow x\times10=48,35\)
\(\Leftrightarrow x=48,35:10\)
\(\Leftrightarrow x=4,835\)
\(Y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}=\dfrac{15}{12}\\ Y=\dfrac{15}{12}\times\dfrac{7}{5}=\dfrac{7}{4}\)
\(y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5\times2}{6\times2}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{10}{12}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{15}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5}{4}\\ \Leftrightarrow y=\dfrac{5}{4}\times\dfrac{7}{5}\\ \Leftrightarrow y=\dfrac{7}{4}\)
\(\Rightarrow C\)