a, y + 21 : 18 = 3
y + \(\frac{7}{6}\)= 3
y = \(\frac{11}{6}\)
Ta có :
a, ( y + 21 ) : 18 = 3 .
=> y + 21 = 3 . 18 .
=> y + 21 = 54 .
=> y = 54 - 21 .
=> y = 33 .
b, y . 3/4 - 1/5 = 7/10 .
=> y . 3/4 = 7/10 + 1/5 .
=> y . 3/4 = 9/10 .
=> y = 9/10 : 3/4 .
=> y = 4/5 .
a) \(\left(y+21\right):18=3\)
\(\Rightarrow y+21=3.18\)
\(\Rightarrow y+21=54\)
\(\Rightarrow y=54-21\)
\(\Rightarrow y=33\)
Vậy y = 33
b) \(y.\frac{3}{4}-\frac{1}{5}=\frac{7}{10}\)
\(\Rightarrow y.\frac{3}{4}=\frac{7}{10}+\frac{1}{5}\)
\(\Rightarrow y.\frac{3}{4}=\frac{9}{10}\)
\(\Rightarrow y=\frac{9}{10}:\frac{3}{4}\)
\(\Rightarrow y=\frac{6}{5}\)
Vậy y = \(\frac{6}{5}\)
_Chúc bạn học tốt_
Ta có :
a, ( y + 21 ) : 18 = 3 .
=> y + 21 = 3 . 18 .
=> y + 21 = 54 .
=> y = 54 - 21 .
=> y = 33 .
b, y . 3/4 - 1/5 = 7/10 .
=> y . 3/4 = 7/10 + 1/5 .
=> y . 3/4 = 9/10 .
=> y = 9/10 : 3/4 .
=> y = 4/5 .