Câu hỏi của luu ngoc huyen

Question

tính nhanh 11/12 nhân 12/13 nhân 13/14 :22/28 3 nhân 7/10 +7/10 nhân 5 cộng 2 nhân 7/10

YangSu · Accepted Answer

$\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}$$=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}$$=\dfrac{11\times12\times13\times14}{12\times13\times14\times11}$$=1$=================$3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}$$=\dfrac{7}{10}\times\left(3+5+2\right)$$=\dfrac{7}{10}\times10=7$Câu trả lời: $\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}$$=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}$$=\dfrac{11\times12\times13\times14}{12\times13\times14\times11}$$=1$=================$3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}$$=\dfrac{7}{10}\times\left(3+5+2\right)$$=\dfrac{7}{10}\times10=7$

HT.Phong (9A5) · Answer

$\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}$$=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{11}{14}$$=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}$$=\dfrac{11\times12\times13\times14}{12\times13\times11\times14}$$=1$$3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}$$=\dfrac{7}{10}\times\left(3+5+2\right)$$=\dfrac{7}{10}\times10$$=7$Câu trả lời: $\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}$$=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{11}{14}$$=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}$$=\dfrac{11\times12\times13\times14}{12\times13\times11\times14}$$=1$$3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}$$=\dfrac{7}{10}\times\left(3+5+2\right)$$=\dfrac{7}{10}\times10$$=7$

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