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39x11+25x11 =(39+25)x11
=64x11
=704
67x11+58x11=(67+58)x11
=125x11
=1375
39x11- 27x11
=(39-27)x11
=12x11
=132
Câu tự lấy ví dụ nhé
1) 39 x 11 + 25 x 11
= 11 x ( 39 + 25 ) = 11 x 64 = 704
67 x 11 + 58 x 11
= 11 x ( 67 + 58 ) = 11 x 125 = 1375
39 x 11 - 27 x 11
= ( 39 - 27 ) x 11 = 12 x 11 = 132
\(=\dfrac{11}{12}\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right)=\dfrac{11}{12}\cdot1=\dfrac{11}{12}\)
5/11.5/7+2/7.5/11
=5/11.(5/7+2/7)
=5/11
15 x 7/15 x 4/9
=7 x 4/9
=28/9
\(a,\dfrac{5}{13}\times\dfrac{4}{15}\times13=\dfrac{5\times4\times13}{13\times5\times3}=\dfrac{4}{3}\\ b,\left(\dfrac{3}{7}+\dfrac{5}{2}\right)\times\dfrac{7}{5}=\dfrac{3}{7}\times\dfrac{7}{5}+\dfrac{5}{2}\times\dfrac{7}{5}=\dfrac{3}{5}+\dfrac{7}{2}=\dfrac{6}{10}+\dfrac{35}{10}=\dfrac{41}{10}\\ c,\dfrac{1}{5}\times\dfrac{11}{18}+\dfrac{11}{18}\times\dfrac{3}{5}=\dfrac{11}{18}\times\left(\dfrac{1}{5}+\dfrac{3}{5}\right)=\dfrac{11}{18}\times\dfrac{4}{5}=\dfrac{22}{45}\)
167/77
\(\frac{5}{11}\)x \(\frac{27}{11}\)- \(\frac{5}{11}\) x \(\frac{2}{7}\)
= \(\frac{5}{11}\)x ( \(\frac{27}{11}\) - \(\frac{5}{11}\))
=\(\frac{5}{11}\)x \(\frac{22}{11}\)
=\(\frac{5}{11}\) x 2 = \(\frac{10}{11}\)