-7/22 nhân 5/3 +-7/22 nhân 1/3 - -7/22 nhân 11/21
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
Y
25 tháng 3 2023
\(\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}\)
\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}\)
\(=\dfrac{11\times12\times13\times14}{12\times13\times14\times11}\)
\(=1\)
=================
\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)
\(=\dfrac{7}{10}\times\left(3+5+2\right)\)
\(=\dfrac{7}{10}\times10=7\)
25 tháng 3 2023
\(\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}\)
\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{11}{14}\)
\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}\)
\(=\dfrac{11\times12\times13\times14}{12\times13\times11\times14}\)
\(=1\)
\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)
\(=\dfrac{7}{10}\times\left(3+5+2\right)\)
\(=\dfrac{7}{10}\times10\)
\(=7\)
CC
1
MH
19 tháng 9 2015
\(\frac{5}{6}+\frac{7}{4}+\frac{11}{24}=\frac{20+42+11}{24}=\frac{73}{24}\)
\(\frac{5}{7}-\frac{2}{5}-\frac{3}{35}=\frac{25-14-3}{35}=\frac{8}{35}\)
\(\frac{4}{9}\times\frac{3}{2}\times\frac{9}{5}=\frac{4\times3\times9}{9\times2\times5}=\frac{6}{5}\)
\(\frac{21}{22}:\frac{7}{11}\times\frac{2}{3}=\frac{21}{22}\times\frac{11}{7}\times\frac{2}{3}=\frac{3}{2}\times\frac{2}{3}=1\)
NL
3
22 tháng 8 2017
A,3/4+2/5x5/6
=3/4+1/3
=9/12+4/12
=13/12
B,11/12:7/24x21/22
=11/12x24/7x21/22
=22/7x21/22
=3
\(-\dfrac{7}{22}\cdot\dfrac{5}{3}+\dfrac{-7}{22}\cdot\dfrac{1}{3}-\dfrac{-7}{22}\cdot\dfrac{11}{21}\)
\(=-\dfrac{7}{22}\cdot\left(\dfrac{5}{3}+\dfrac{1}{3}\right)+\dfrac{7}{21}\cdot\dfrac{11}{22}\)
\(=-\dfrac{7}{22}\cdot2+\dfrac{1}{3}\cdot\dfrac{1}{2}=-\dfrac{7}{11}+\dfrac{1}{6}\)
\(=\dfrac{-42+11}{66}=\dfrac{-31}{66}\)
\(-\dfrac{7}{22}\cdot\dfrac{5}{3}+\dfrac{-7}{22}\cdot\dfrac{1}{3}-\left(-\dfrac{7}{22}\right)\cdot\dfrac{11}{21}\\=-\dfrac{7}{22}\cdot\dfrac{5}{3}-\dfrac{7}{22}\cdot\dfrac{1}{3}-\dfrac{7}{22}\cdot\dfrac{-11}{21}\\ =-\dfrac{7}{22}.\left(\dfrac{5}{3}+\dfrac{1}{3}-\dfrac{11}{21}\right)\\ =-\dfrac{7}{22}\cdot\dfrac{31}{21}\\ =-\dfrac{31}{66}\)