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Bài 1:
\(g.\frac{5}{11}+\frac{6}{11}=\frac{5+6}{11}=\frac{11}{11}=1\)\(\)
\(e.\frac{-17}{25}.\frac{20}{33}+\frac{-17}{25}.\frac{13}{33}+\frac{-3}{25}=\frac{-17}{25}.\left(\frac{20}{33}+\frac{13}{33}\right)+\frac{-3}{25}\)
\(=\frac{-17}{25}.1+\frac{-3}{25}=\frac{-17}{25}+\frac{-3}{25}=\frac{-17-3}{25}=\frac{-20}{25}=\frac{-4}{5}\)
\(d.\frac{5}{7}.\frac{19}{23}+\frac{5}{7}.\frac{5}{23}-\frac{5}{7}.\frac{1}{23}=\frac{5}{7}\left(\frac{19}{23}+\frac{5}{23}-\frac{1}{23}\right)\)
\(=\frac{5}{7}\left(\frac{19+5-1}{23}\right)=\frac{5}{7}.1=\frac{5}{7}\)
\(c.\left(-11\right).\frac{9}{22}=\frac{\left(-11\right).9}{22}=\frac{-99}{22}=\frac{-9}{2}\)
\(b.\frac{5}{6}-\frac{1}{8}=\frac{5.4}{6.4}-\frac{1.3}{8.3}=\frac{20}{24}-\frac{3}{24}=\frac{17}{24}\)
\(a.\frac{2}{3}+\frac{1}{5}-\frac{1}{6}=\frac{2.10}{3.10}+\frac{1.6}{5.6}-\frac{1.5}{6.5}=\frac{20}{30}+\frac{6}{30}-\frac{5}{30}\)
\(=\frac{20+6-5}{30}=\frac{21}{30}=\frac{7}{10}\)
Bài 2:
\(a.\frac{3}{4}+x=\frac{11}{12}\)
\(\Leftrightarrow x=\frac{11}{12}-\frac{3}{4}\)
\(\Leftrightarrow x=\frac{11}{12}-\frac{9}{12}\)
\(\Leftrightarrow x=\frac{2}{12}=\frac{1}{6}\)
\(b.x-\frac{11}{12}=0,5\)
\(\Leftrightarrow x=\frac{1}{2}-\frac{11}{12}\)
\(\Leftrightarrow x=\frac{6}{12}+\frac{11}{12}\)
\(\Leftrightarrow x=\frac{17}{12}\)
a)\(\frac{2}{7}+\frac{3}{8}=\frac{16}{56}+\frac{21}{56}=\frac{37}{56}\)
b)\(\frac{7}{56}:\frac{20}{25}=\frac{6}{56}x\frac{25}{20}=\frac{150}{1120}=\frac{15}{112}\)
c)\(\frac{20}{35}x\frac{5}{4}=\frac{100}{140}=\frac{5}{7}\)
d)\(\frac{8}{7}-\frac{5}{6}=\frac{48}{56}-\frac{35}{56}=\frac{13}{56}\)
A) (12/24 + 24/32 - 5/20) : 4/5
= (1/2 + 3/4 - 1/4) : 4/5
=(1/2 + 1/2) : 4/5
= 1 : 4/5
= 5/4
B) 75/100 + 1/5 - 11/3 + 25/100
= 3/4 + 1/5 - 11/3 + 1/4
= (3/4 + 1/4) - 1/5+11/3
= 1 - 1/5 + 11/3
= 4/5 + 11/3
= 67/15
( mk ko chắc câu B)
\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}=\frac{27.100}{\frac{\left(2+18\right).9}{2}}=30\)
\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}=\frac{26\left(108-12\right)}{\left(32-28\right).4}=\frac{26.96}{4.4}=156\)
\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}=\frac{270.450+270.550}{\frac{\left(2+8\right).9}{2}}\)
\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}=\frac{48.700-48.450}{5.5}\)\(=\frac{48\left(700-450\right)}{25}=\frac{48.250}{25}=480\)
#ĐinhBa
a) MSC : 60
17/20= 17.3/20.3= 51/60
13/15= 13.4/15.4=52/60
41/60=41.1/60.1=41/60
Lúc chiều mk vừa làm xong nên ko sai đâu. Thầy chữa bài này luôn rồi
A)51/60;52/60;41/60
B)748/2244;1122/2244;2057/2244
C)300/2400;2280/2400;1280/2400
Tự rút gọn nhé...
Câu d thì mình...
a)32/20+3/4=47/20
b)20/6+2=16/3
c)25+5/25=126/5
d)5/4+2/4+6/20=41/20
a) \(\frac{32}{20}+\frac{3}{4}=\frac{32}{20}+\frac{15}{20}=\frac{47}{20}\)
b) \(\frac{20}{6}+2=\frac{10}{3}+\frac{6}{3}=\frac{16}{3}\)
c) \(25+\frac{5}{25}=\frac{125}{5}+\frac{1}{5}=\frac{126}{5}\)
d) \(\frac{5}{4}+\frac{2}{4}+\frac{6}{20}=\frac{7}{4}+\frac{6}{20}=\frac{35}{20}+\frac{6}{20}=\frac{41}{20}\)
~HT~