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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
\(x\times9,75+25\%\times x=48,35\)
\(\Leftrightarrow x\times9,75+\frac{25}{100}\times x=48,35\)
\(\Leftrightarrow x\times\left(9,75+\frac{25}{100}\right)=48,35\)
\(\Leftrightarrow x\times\left(9,75+0,25\right)=48,35\)
\(\Leftrightarrow x\times10=48,35\)
\(\Leftrightarrow x=48,35:10\)
\(\Leftrightarrow x=4,835\)
a) y x 5 = 1948 + 247
y x 5 = 2195
y = 2195 : 5
y = 439
b) y : 3 = 190 - 90
y : 3 = 100
y = 100 x 3
y = 300
c) y - 8357 = 3829 x 2
y - 8357 = 7658
y = 7658 + 8357
y = 16 015
d) y x 8 = 182 x 4
y x 8 = 728
y = 728 : 8
y = 91
a) y x 5 = 1948 + 247
y x 5 = 2195
y = 2195 :5
y = 439
b) y : 3 = 190 - 90
y : 3 = 100
y = 100 x 3
y = 300
c) y - 8357 = 3829 x 2
y - 8357 = 7658
y = 7658 + 8357
y = 16015
d) y x 8 = 182 x 4
y x 8 = 728
y = 728 : 8
y = 91
\(Y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}=\dfrac{15}{12}\\ Y=\dfrac{15}{12}\times\dfrac{7}{5}=\dfrac{7}{4}\)
\(y:\dfrac{7}{5}=\dfrac{5}{6}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5\times2}{6\times2}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{10}{12}+\dfrac{5}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{15}{12}\\ \Leftrightarrow y:\dfrac{7}{5}=\dfrac{5}{4}\\ \Leftrightarrow y=\dfrac{5}{4}\times\dfrac{7}{5}\\ \Leftrightarrow y=\dfrac{7}{4}\)
\(\Rightarrow C\)