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\(\frac{6}{11}.\frac{15}{19}+\frac{15}{19}:\frac{11}{16}=\frac{6}{11}.\frac{15}{19}+\frac{15}{19}.\frac{16}{11}=\frac{15}{19}.\left(\frac{6}{11}+\frac{16}{11}\right)=\frac{15}{19}.2=\frac{30}{19}\)
Ta co : \(\frac{6}{11}.\frac{15}{19}+\frac{15}{19}:\frac{11}{16}\)
\(=\frac{6}{11}.\frac{15}{19}+\frac{15}{19}.\frac{16}{11}\)
\(=\frac{5}{19}\left(\frac{6}{11}+\frac{16}{11}\right)\)
\(=\frac{5}{19}.\frac{22}{11}\)
\(=\frac{5}{19}.2\)
\(=\frac{10}{19}\)
\(\left(\frac{3}{10}-\frac{4}{15}-\frac{7}{20}\right).\frac{5}{19}=-\frac{19}{20}.\frac{5}{19}=-\frac{1}{4}\)
\(\left(\frac{1}{14}+\frac{1}{7}-\frac{-3}{35}\right).\frac{-4}{3}=\frac{3}{10}.-\frac{4}{3}=-\frac{4}{10}=-\frac{2}{5}\)
Từ bé đến lớn : 13/14;14/15;15/16;16/17;17/18;18/19;19/20
Chúc bạn học tốt nhé!!!
\(\frac{5}{8}.\frac{15}{19}+\frac{5}{8}.\frac{16}{19}-\frac{5}{8}.\frac{21}{19}=\frac{5}{8}.\left(\frac{15}{19}+\frac{16}{19}-\frac{21}{19}\right)=\frac{5}{8}.0=0\)
sorry, nhầm rồi
\(\frac{5}{8}.\frac{15}{19}+\frac{5}{8}.\frac{16}{19}-\frac{5}{8}.\frac{21}{19}=\frac{5}{8}.\left(\frac{15}{19}+\frac{16}{19}-\frac{21}{19}\right)=\frac{5}{8}.\frac{10}{19}=\frac{50}{152}=\frac{25}{76}\)
dấu chấm là dấu nhân
\(\frac{19}{35}+\frac{15}{19}+\frac{16}{35}+\frac{23}{19}+\frac{4}{15}+\frac{11}{15}\)
\(=\left(\frac{19}{35}+\frac{16}{35}\right)+\left(\frac{15}{19}+\frac{23}{19}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)
\(=\frac{35}{35}+\frac{38}{19}+\frac{15}{15}\)
\(=1+2+1\)
\(=4\)
\(\frac{19}{35}+\frac{15}{19}+\frac{16}{35}+\frac{23}{19}+\frac{4}{15}+\frac{11}{15}\)
\(=\left(\frac{19}{35}+\frac{16}{35}\right)+\left(\frac{15}{19}+\frac{23}{19}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)
\(=1+2+1\)
\(=4\)
Học tốt