rút gọn rồi tính
24/15x56/72x10/14
32/48x35/21x63/14x9/30
hiệp 4a4 ơi kết bạn đe
nhanh lên bạn êy
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\(a,\frac{17}{51}x\frac{45}{30}=\frac{1}{3}x\frac{3}{2}=\frac{1}{2}\)
\(b,\frac{54}{36}x\frac{11}{33}=\frac{3}{2}x\frac{1}{3}=\frac{1}{2}\)
\(c,\frac{24}{15}x\frac{56}{72}=\frac{8}{5}x\frac{7}{9}=\frac{56}{45}\)
\(\frac{32}{48}x\frac{35}{21}x\frac{63}{14}x\frac{9}{30}=\frac{2}{3}x\frac{5}{3}x\frac{9}{2}x\frac{3}{10}=\frac{270}{180}=\frac{3}{2}\)
\(\frac{4}{5}+\frac{3}{15}=\frac{4}{5}+\frac{1}{5}=\frac{4+1}{5}=\frac{5}{5}=1\)
\(\frac{2}{3}+\frac{32}{24}=\frac{2}{3}+\frac{4}{3}=\frac{2+4}{3}=\frac{6}{3}=2\)
\(\frac{5}{6}+\frac{15}{18}=\frac{5}{6}+\frac{5}{6}=\frac{5+5}{6}=\frac{10}{6}\)
HT
1, Rút gọn rồi tính
a) \(\frac{4}{5}+\frac{3}{15}\)
= \(\frac{4}{5}+\frac{1}{5}\)
= \(\frac{5}{5}\)
= \(1\)
b) \(\frac{2}{3}+\frac{32}{24}\)
= \(\frac{2}{3}+\frac{4}{3}\)
= \(\frac{6}{3}\)
= \(2\)
c) \(\frac{5}{6}+\frac{15}{18}\)
= \(\frac{5}{6}+\frac{5}{6}\)
= \(\frac{10}{6}\)
= \(\frac{5}{3}\)
2, Tính rồi rút gọn
a) \(\frac{8}{15}+\frac{2}{3}\)
= \(\frac{8}{15}+\frac{10}{15}\)
= \(\frac{18}{15}\)
= \(\frac{6}{5}\)
b) \(\frac{3}{7}+\frac{4}{8}\)
= \(\frac{24}{56}+\frac{28}{56}\)
= \(\frac{52}{56}\)
= \(\frac{13}{14}\)
\(a.\frac{2}{5}+\frac{3}{6}=\frac{2}{5}+\frac{1}{2}=\frac{4}{10}+\frac{5}{10}=\frac{9}{10}.\)
\(b.\frac{21}{30}-\frac{9}{30}=\frac{21-9}{30}=\frac{12}{30}=\frac{2}{5}\)
\(c.\frac{5}{8}\cdot\frac{4}{7}=\frac{5\cdot4}{8\cdot7}=\frac{5\cdot1}{2\cdot7}=\frac{5}{14}\)
\(d.\frac{7}{9}:\frac{11}{6}=\frac{7}{9}\cdot\frac{6}{11}=\frac{7\cdot6}{9\cdot11}=\frac{7\cdot2}{3\cdot11}=\frac{14}{33}\)