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A=-4/7.2/9+-4/7.7/9+18/7
= -4/7.(2/9+7/9)+18/7
= -4/7.1+18/7=-4/7+18/7=14/7=2
A= -4/7. 2/9+ -4/7.7/9 + 18/7
A =-4/7.(2/9+7/9)+18/7
A =4/7.1+18/7
A=4/7+18/7
A=22/7
A =\(\frac{2}{7}\times\frac{7}{15}-\frac{2}{3}\times\frac{5}{27}\) =\(\frac{14}{105}-\frac{10}{81}\)=\(\frac{2}{15}-\frac{10}{81}\)=\(\frac{162}{1215}-\frac{150}{1215}\)=\(\frac{12}{1215}\)
\(\frac{-4}{9}\times\frac{7}{15}+\frac{4}{9}\times\frac{5}{27}\)=\(\frac{-28}{135}+\frac{20}{243}\)=\(\frac{-6804}{32805}+\frac{2700}{32805}\)=\(\frac{-4104}{32805}\)=\(\frac{-152}{1215}\)
A=\(\frac{2}{7}\times\frac{7}{15}-\frac{2}{3}\times\frac{5}{27}\)chia cho\(\frac{-4}{9}\times\frac{7}{15}+\frac{4}{9}\times\frac{5}{27}\)
= \(\frac{12}{1215}:\frac{-152}{1215}\)
=\(\frac{12}{1215}\times\frac{1215}{-152}\)
=\(\frac{14580}{-184680}\)
\(\frac{14580}{-184680}\)rút gọn bằng\(\frac{-3}{38}\)
\(7\frac{5}{9}-\left(3\frac{5}{9}-2\frac{3}{4}\right)=7\frac{5}{9}-3\frac{5}{9}+2\frac{3}{4}=4+2\frac{3}{4}=6\frac{3}{4}\)
\(7\frac{5}{9}-\left(3\frac{5}{9}-2\frac{3}{4}\right)=7\frac{5}{9}-3\frac{5}{9}+2\frac{3}{4}=4+2\frac{3}{4}=6\frac{3}{4}\)
a,\(\frac{5}{6}:\frac{-7}{12}\) b, \(\frac{-21}{24}:\frac{-14}{8}\)
d,\(\frac{4}{5}:\frac{-8}{15}\)e,\(\frac{3}{5}+\frac{-7}{4}\)
g,\(\frac{5}{12}-\frac{-7}{12}\)h,\(\frac{-15}{16}.\frac{8}{-25}\)
A=-4/7.(2/9+7/9)+18/7
=-4/7.1+18/7
=-4/7+18/7=14/7=2
lạy!!!