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c)\(\dfrac{3}{8}\times\dfrac{5}{8}+y=\dfrac{5}{4}\)
\(\dfrac{15}{64}+y=\dfrac{5}{4}\)
\(y=\dfrac{5}{4}-\dfrac{15}{64}\)
\(y=\dfrac{65}{64}\)
d, \(\dfrac{3}{8}+\dfrac{5}{8}\times y=\dfrac{5}{4}\)
\(\dfrac{5}{8}\times y=\dfrac{5}{4}-\dfrac{3}{8}\)
\(\dfrac{5}{8}\times y=\dfrac{7}{8}\)
\(y=\dfrac{7}{8}:\dfrac{5}{8}\)
\(y=\dfrac{7}{5}\)
a, 3/4 x y = 3/5 + 3/10
3/4 x y = 9/10
y = 9/10 : 3/4
y = 6/5
b, 3/5 : y = 3/4 - 2/5
3/5 : y = 7/20
y = 3/5 : 7/20
y = 12/7
Câu đầu em xem lại đề bài sao có hai dấu bằng.
Câu 2:
\(\dfrac{3}{2}\) \(\times\)y - \(\dfrac{3}{4}\) \(\times\)y + y = \(\dfrac{4}{5}\)
y \(\times\) ( \(\dfrac{3}{2}\) - \(\dfrac{3}{4}\) + 1) = \(\dfrac{4}{5}\)
y \(\times\) (\(\dfrac{6}{4}\) - \(\dfrac{3}{4}\) + \(\dfrac{4}{4}\)) = \(\dfrac{4}{5}\)
y \(\times\) \(\dfrac{7}{4}\) = \(\dfrac{4}{5}\)
y = \(\dfrac{4}{5}\): \(\dfrac{7}{4}\)
y = \(\dfrac{16}{35}\)
\(\left(y-\dfrac{2}{5}\right):\dfrac{4}{3}=\dfrac{3}{8}\\ \Leftrightarrow y-\dfrac{2}{5}=\dfrac{3}{8}\cdot\dfrac{4}{3}\\ \Leftrightarrow y-\dfrac{2}{5}=\dfrac{1}{2}\\ \Leftrightarrow y=\dfrac{9}{10}\)
\(\left(y-\dfrac{2}{5}\right):\dfrac{4}{3}=\dfrac{3}{8}\)
\(y-\dfrac{2}{5}=\dfrac{3}{8}\cdot\dfrac{4}{3}=\dfrac{3\cdot4}{2\cdot4\cdot3}\)
\(y-\dfrac{2}{5}=\dfrac{1}{2}\)
\(y=\dfrac{1}{2}+\dfrac{2}{5}\)
\(y=\dfrac{5}{10}+\dfrac{4}{10}=\dfrac{9}{10}\)
a, \(\frac{2}{5}\)+ y = 1
y = 1 - \(\frac{2}{5}\)
y = \(\frac{3}{5}\)
b, \(\frac{6}{8}\)- y = \(\frac{3}{5}\)
y = \(\frac{6}{8}\)- \(\frac{3}{5}\)
y = \(\frac{3}{20}\)
c, y : 6 = \(\frac{7}{4}\)
y = \(\frac{7}{4}\)x 6
y = \(\frac{21}{2}\)
d, y - \(\frac{1}{3}\)= 5 x \(\frac{2}{3}\)
y - \(\frac{1}{3}\)= \(\frac{10}{3}\)
y = \(\frac{10}{3}\)+ \(\frac{1}{3}\)
y = \(\frac{11}{3}\)
a,2/5 + y = 1
y = 1 - 2/5
y = 3/5
b, 6/8 - y = 3/5
y = 6/8 - 3/5
y = 3/10
c, y / 6 = 7/4
y = 7/4 * 6
y = 15/2
d, y - 1/3 = 5 * 2/3
y - 1/3 = 10/3
y = 10/3 + 1/3
y = 11/3
\(\dfrac{y}{8}:\dfrac{3}{5}=\dfrac{5}{8}\)
\(\dfrac{y}{8}=\dfrac{5}{8}\times\dfrac{3}{5}\)
\(\dfrac{y}{8}=\dfrac{3}{8}\)
\(y\times8=3\times8\)
\(y\times8=24\)
\(y=3\)
Y/8 : 3/5 = 5/8
= Y/8 = 5/8 x 3/5
= Y / 8 = 3/8
= Y x 8 = 3 x 8
= Y x 8 = 24
= Y = 24 : 8
= Y = 3