Câu hỏi của Xanh Thiếu Muối

Question

(15 - 6$\frac{13}{18}$ ) : 11$\frac{1}{27}$ - 2$\frac{1}{8}$ : 1$\frac{11}{40}$

70. ( $\frac{131313}{565656}$ + $\frac{131313}{727272}$ + $\frac{131313}{909090}$ )

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👁💧👄💧👁 · Accepted Answer

$\left(15-6\frac{13}{18}\right):11\frac{1}{27}-2\frac{1}{8}:1\frac{11}{40}\
=\left(\frac{270}{18}-\frac{121}{18}\right):\frac{298}{27}-\frac{17}{8}:\frac{51}{40}\
=\frac{149}{18}\cdot\frac{27}{298}-\frac{17}{8}\cdot\frac{40}{51}\
=\frac{3}{4}-\frac{5}{3}\
=\frac{9}{12}-\frac{20}{12}=\frac{-11}{12}$

$70\cdot\left(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\right)\
=70\cdot\left(\frac{13}{56}+\frac{13}{72}+\frac{13}{90}\right)\
=70\cdot13\cdot\left(\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\
=910\cdot\left(\frac{45}{2520}+\frac{35}{2520}+\frac{28}{2520}\right)\
=910\cdot\frac{3}{70}=39$Câu trả lời: $\left(15-6\frac{13}{18}\right):11\frac{1}{27}-2\frac{1}{8}:1\frac{11}{40}\
=\left(\frac{270}{18}-\frac{121}{18}\right):\frac{298}{27}-\frac{17}{8}:\frac{51}{40}\
=\frac{149}{18}\cdot\frac{27}{298}-\frac{17}{8}\cdot\frac{40}{51}\
=\frac{3}{4}-\frac{5}{3}\
=\frac{9}{12}-\frac{20}{12}=\frac{-11}{12}$

$70\cdot\left(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\right)\
=70\cdot\left(\frac{13}{56}+\frac{13}{72}+\frac{13}{90}\right)\
=70\cdot13\cdot\left(\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\
=910\cdot\left(\frac{45}{2520}+\frac{35}{2520}+\frac{28}{2520}\right)\
=910\cdot\frac{3}{70}=39$

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