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\(a,\frac{1}{2}\times\frac{4}{5}\div\frac{6}{10}\)
\(=\frac{2}{5}\div\frac{6}{10}\)
\(=\frac{2}{5}\times\frac{10}{6}\)
\(=\frac{2}{3}\)
\(b,\frac{24}{35}\div\left(\frac{4}{5}\times\frac{8}{7}\right)\)
\(=\frac{24}{35}\div\frac{32}{35}\)
\(=\frac{24}{35}\times\frac{35}{32}\)
\(=\frac{3}{4}\)
\(=\frac{20}{45}+\frac{32}{3}.45\)
\(=\frac{20}{45}+480\)
\(=\frac{4324}{9}\)
tíc mình nha
1 \(A=\left(1+\frac{1}{2}\right)\times\left(1+\frac{1}{3}\right)\times\left(1+\frac{1}{4}\right)\times.........\times\left(1+\frac{1}{2016}\right)\times\left(1+\frac{1}{2017}\right)\)
\(A=\frac{3}{2}\times\frac{4}{3}\times\frac{5}{4}\times......\times\frac{2016}{2017}\times\frac{2018}{2017}\)
\(A=\frac{2018}{2}=1009\)
\(B=\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+.......+\frac{2}{43.45}\)
\(B=\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-......+\frac{1}{43}-\frac{1}{45}\)
\(B=\frac{1}{3}-\frac{1}{45}\)
\(B=\frac{14}{45}\)
2 \(\frac{2017}{2018}\times\frac{23}{47}+\frac{24}{2018}\times\frac{2017}{47}\)
\(=\frac{2017}{2018}\times\frac{23}{47}+\frac{24}{47}\times\frac{2017}{2018}\)
\(=\frac{2017}{2018}\times\left(\frac{23}{47}+\frac{24}{47}\right)\)
\(=\frac{2017}{2018}\times1\)
=\(\frac{2017}{2018}\)
bạn nào xem giải thế có đúng ko
\(\frac{5}{8}:x=\frac{3}{4}\)
\(x=\frac{5}{8}:\frac{3}{4}\)
\(x=\frac{5}{6}\)
\(\frac{2}{4}+\frac{3}{4}:\frac{1}{2}\)
\(=\frac{2}{4}+\frac{6}{4}\)
\(\frac{8}{4}=2\)
Hok tốt
\(\frac{7}{3}+\frac{4}{3}:\frac{5}{4}\\ =\frac{7}{3}+\frac{4}{3}\cdot\frac{4}{5}\\ =\frac{7}{3}+\frac{16}{15}\\ =\frac{35}{15}+\frac{16}{15}\\ =\frac{51}{15}\\ \frac{17}{15}\)
Ta có :
\(5-\frac{7}{5}:\frac{3}{10}+\frac{2}{5}\)
\(=5-\frac{7}{5}x\frac{10}{3}+\frac{2}{5}\)
\(=5-\frac{14}{3}+\frac{2}{5}\)
\(=\frac{15}{3}-\frac{14}{3}+\frac{6}{15}\)
\(=\frac{1}{3}+\frac{6}{15}\)
\(=\frac{5}{15}+\frac{6}{15}\)
\(=\frac{11}{15}\)
Tham khảo nha !!!!
5 - \(\frac{7}{5}\): \(\frac{3}{10}\)+ \(\frac{2}{5}\)= 5 - \(\frac{14}{3}\)+ \(\frac{2}{5}\)
= \(\frac{1}{3}\)+ \(\frac{2}{5}\)
= \(\frac{11}{15}\)
\(\frac{6}{5}\)x 5 - \(\frac{17}{5}\)= \(\frac{30}{5}\)- \(\frac{17}{5}\)=\(\frac{13}{5}\)
ta có:4/5*5+4\10*5)-17/5
=20/5+20/10)-17/5
=50/10-17/5
=10/1+(-17)/5
=-33/5
mk nghĩ là vậy !nếu mk làm sai thìcho mk xin lỗi ! đúng thì tích cho mk!nếu k hiểu hỏi lại nha