\(\Rightarrow2+\frac{3}{\frac{7-4y}{2-y}}=7\)
\(\Rightarrow\frac{3}{\frac{7-4y}{2-y}}=5\)
\(\Rightarrow3\times\frac{2-y}{7-4y}=5\)
\(\Rightarrow\frac{2-y}{7-4y}=\frac{5}{3}\Rightarrow3\left(2-y\right)=5\left(7-4y\right)\)
\(\Rightarrow6-3y=35-20y\)
\(\Rightarrow17y=29\Rightarrow y=\frac{29}{17}\)
Tìm Y: \(Y x \frac{2}{5} - Y x \frac{4}{15} = \frac{3}{2}\)
\(\frac{2}{3} : Y + \frac{7}{8} : Y = \frac{1}{2}\)
Giúp nhanhh xD
\(\frac{1}{1×2}+\frac{1}{2×3}\: +\frac{1}{3×4}\: +\frac{1}{4×5}+\frac{1}{5×6}\: +\frac{1}{6×7}+\frac{1}{7×8}+\frac{1}{8×9}\: =?\)
bài 1 : tính phân số:
a) \(\frac{5}{7}+\frac{4}{9}=?;\frac{4}{5}-\frac{2}{3}=?;\frac{9}{11}+\frac{3}{8}=?;\frac{16}{25}-\frac{2}{5}=?\)=?
b)\(5+\frac{3}{5}=?;10-\frac{9}{16}=?;\frac{2}{3}-\left(\frac{1}{6}+\frac{1}{8}\right)=?\)
c)\(\frac{5}{7}+\frac{7}{6}=?;\frac{7}{12}+\frac{17}{18}=?;\frac{9}{8}+\frac{15}{32}=?;4+\frac{35}{45}=?\)
d)\(\frac{11}{4}-\frac{15}{16}=?;\frac{5}{6}-\frac{5}{8}=?;\frac{196}{64}-2=?;3-\frac{13}{9}=?\)
e)\(\frac{8}{5}+\frac{7}{6}+\frac{5}{9}-2=?;3-\frac{5}{6}-\frac{4}{9}+\frac{32}{24}=?\)
1. Tính nhanh
a) \(\frac{8}{7}\times\frac{2}{5}+\frac{6}{7}\times\frac{2}{5}=\)
b) \(\frac{40}{11}\times\frac{4}{7}-\frac{4}{7}\times\frac{7}{11}=\)
c)\(\frac{3}{4}\times\frac{6}{15}\times\frac{4}{3}=\)
d) \(\frac{1}{2}\times\frac{2}{3}\times\frac{4}{5}\times\frac{2}{3}\times\frac{5}{4}=\)
giúp mình nha mình cần gấp lắm
Tính nhanh
a) \(\frac{2}{3}\div\frac{4}{9}+\frac{1}{3}\div\frac{4}{9}=\)
b) \(\frac{9}{8}\div\frac{5}{7}-\frac{1}{8}\div\frac{5}{7}=\)
c) \(\frac{2}{5}\div\frac{7}{3}-\frac{2}{5}\div\frac{1}{3}=\)
d) \(\frac{3}{7}\div\frac{7}{3}+\frac{3}{7}\div\frac{9}{4}=\)
\(\frac{7}{8}+\frac{\left(\frac{3}{4}-\frac{1}{2}\cdot\frac{2}{3}\right)}{\frac{4}{5}}\)
2 . tính
\(\frac{12}{5}-\frac{4}{5}=\)
\(\frac{11}{6}-\frac{2}{3}=\)
\(\frac{7}{8}-\frac{2}{7}=\)
3 . tính theo mẫu : Mẫu : 2\(-\frac{3}{2}=\frac{4}{2}-\frac{3}{2}=\frac{1}{2}\)
\(4-\frac{8}{5}=\)
\(2-\frac{3}{8}=\)
\(\frac{16}{7}-2=\)
\(\frac{25}{4}-3=\)
B1:Tính
a)\(3\frac{4}{7}x2\frac{4}{5}\)
b)\(\frac{4}{5}:\frac{1}{2}+\frac{17}{3}\)
c)\(5\frac{1}{3}-2\frac{1}{6}\)
d)\(4\frac{1}{2}:2\frac{1}{4}\)
Tìm y:
y X\(\frac{52}{26}=\frac{17}{13}\)
\(4\frac{1}{2}:y=\frac{2}{7}\)
