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\(\frac{3}{5}:\frac{7}{3}+\frac{3}{5}:\frac{7}{4}-1\frac{3}{5}\)
\(=\frac{3}{5}.\frac{3}{7}+\frac{3}{5}.\frac{4}{7}-1\frac{3}{5}\)
\(=\frac{3}{5}.\left(\frac{3}{7}+\frac{4}{7}\right)-1\frac{3}{5}\)
\(=\frac{3}{5}.1-1+\frac{3}{5}\)
\(=\frac{3}{5}-\frac{3}{5}-1\)
\(=-1\)
a) 35 :73 +35 :74 −135
\(=\frac{49}{20}-\frac{8}{5}\)
= \(\frac{17}{20}\)
a)\(\frac{2}{3}+\frac{3}{4}+\frac{5}{6}\)
\(=\frac{8+9+10}{12}\)
\(=\frac{27}{12}=\frac{9}{4}\)
b)\(\frac{15}{8}-\frac{7}{12}+\frac{5}{6}\)
\(=\frac{45-14+20}{24}\)
\(=\frac{51}{24}=\frac{17}{8}\)
2)
a)\(\frac{2}{5}+\frac{7}{13}+\frac{3}{5}+\frac{1}{7}\)
\(=\frac{2}{5}+\frac{3}{5}+\frac{7}{13}+\frac{1}{7}\)
\(=1+\frac{7}{13}+\frac{1}{7}\)
\(=\frac{20}{13}+\frac{1}{7}\)
\(=\frac{153}{91}\)
Tí tớ trả lời tiếp
-5/12 . 2/7 + 7/12 . -3/4
= -10/84 + -21/48
= -5/42 + -7/16
= -40/336 + -147/336
= -187/336
\(\frac{-5}{12}\).\(\frac{2}{7}\)+\(\frac{7}{12}\).\(\frac{-3}{4}\)
=\(\frac{5}{12}\).\(\frac{-2}{7}\)+\(\frac{7}{12}\).\(\frac{-3}{4}\)
=\(\frac{5}{12}\).(\(\frac{-2}{7}\)+\(\frac{-3}{4}\))
\(\frac{5}{12}\).\(\frac{-29}{28}\)
=\(\frac{-145}{336}\)
((nho k cho mink nhe)
=10/3-17/21.7/5(. là nhân đó nha mọi người)
=10/3-17/15
=11/5
\(\frac{10}{3}-\left(6\frac{1}{7}-5\frac{1}{3}\right):\frac{5}{7}\)
\(=\frac{10}{3}-\left(\frac{43}{7}-\frac{16}{3}\right):\frac{5}{7}\)
\(=\frac{10}{3}-\frac{17}{21}:\frac{5}{7}\)
\(=\frac{10}{3}-\frac{17}{15}\)
\(=\frac{50}{15}-\frac{17}{15}=\frac{50-17}{15}=\frac{33}{15}=\frac{11}{5}\)
\(\frac{5}{9}-\frac{7}{13}-\frac{5}{9}.\frac{3}{13}+\frac{-5}{9}.\frac{6}{9}\)
= \(\frac{5}{9}-\frac{7}{13}-\frac{5}{3}.\frac{1}{13}+\frac{-5}{3}.\frac{2}{9}\)
=\(\frac{5}{9}-\frac{7}{13}-\frac{5}{39}+\frac{-10}{27}\)
=\(\frac{5}{9}+\frac{-7}{13}+\frac{-5}{39}+\frac{-10}{27}\)
=\(\frac{-13}{27}\)
Chúc bạn học tốt nhea ♥♥♥
\(\frac{5}{9}-\frac{7}{13}-\frac{5}{9}.\frac{3}{13}+\frac{-5}{9}.\frac{61}{9}\)
\(=\frac{5}{9}\left(1-\frac{3}{13}\right)-\frac{7}{13}-\frac{5}{9}.\frac{61}{9}\)
\(=\frac{5}{9}.\frac{10}{13}-\frac{5}{9}.\frac{61}{9}-\frac{7}{13}\)
\(=\frac{5}{9}\left(\frac{10}{13}-\frac{61}{9}\right)-\frac{7}{13}\)\(=-\frac{314}{81}\)
a,\(\frac{-3}{5}-\left(\frac{-2}{5}+2\right)=\frac{-3}{5}-\frac{8}{5}=1\)
b,\(\frac{-21}{10}+\frac{21}{10}.\frac{5}{7}=-\frac{21}{10}+\frac{105}{70}=-\frac{21}{10}+\frac{15}{10}=-\frac{6}{10}\)
a, 6/7+5/9+8/7-2/9=(6/7+8/7)+(5/9-2/9)=14/7+3/9=2+1/3=7/3
b, 5+7/3=22/3
a. \(1\frac{5}{7}\)-\(\frac{9}{7}\)*\(\frac{16}{9}\)
=\(\frac{12}{7}\)-\(\frac{16}{7}\)
=\(\frac{-4}{7}\)
b. \(\frac{-5}{8}\):\(\frac{1}{4}\)-\(\frac{6}{13}\)*4+\(\frac{3}{8}\)
=\(\frac{-5}{8}\cdot\)4-\(\frac{6}{13}\)*4+\(\frac{3}{8}\)
=4*(\(\frac{-5}{8}\)-\(\frac{6}{13}\))+\(\frac{3}{8}\)
=4*\(\frac{-113}{104}\)+\(\frac{3}{8}\)
=\(\frac{-113}{26}\)+\(\frac{3}{8}\)
=\(\frac{-413}{104}\)
c.( \(\frac{3}{8}\)+\(\frac{-1}{4}\)-\(\frac{5}{12}\)):\(\frac{1}{3}\)
=\(\frac{-7}{24}\)*3
=\(\frac{-7}{8}\)
Học tốt
\(\frac{-3}{5}+\frac{5}{7}=\frac{4}{35}\)
Nhớ k mình nha bạn!nếu k lần sau mình sẽ trả lời tiếp!
\(\frac{-3}{5}\)+ \(\frac{5}{7}\)= \(-\frac{3}{5}\)+ \(\frac{5}{7}\)= \(\frac{4}{35}\)