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viết rõ lại cái đề giùm tui tui mới làm được
\(\frac{6}{7}+\frac{2}{5}-\frac{1}{2}+2\frac{38}{91}-\frac{4}{5}=\frac{27300}{31850}+\frac{12740}{31850}-\frac{15925}{31850}+\) \(2\frac{13300}{31850}\)\(-\frac{25480}{31850}\)
\(=2\frac{27300+12740-15925+13300-25480}{31850}\)\(=2\frac{341}{910}\)
HỌC TỐT!!!
Ta có : \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{2}{5}+\frac{5}{11}+\frac{19}{13}+\frac{1}{2}+\frac{2}{3}-\frac{1}{6}\)
\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{1}{2}+\frac{2}{3}-\frac{1}{6}\right)\)
\(=1+1+2+1=5\)
= (3/5 + 2/5) + (6/11 + 5/11) + (7/13 + 19/13) : 1/2 + 2/3 - 1/6
= (1 + 1 + 2) : (1/2 + 4/6 - 1/6)
= 4 : (1/2 + 1/2)
= 4 : 1
= 4
Vậy kết quả bằng 4
\(\frac{5}{6}+\frac{1}{12}+\frac{2}{3}+\frac{2}{7}+\frac{1}{25}+\frac{1}{4}-\frac{5}{42}\)
\(=\left(\frac{5}{6}+\frac{2}{7}-\frac{5}{42}\right)+\left(\frac{1}{12}+\frac{2}{3}+\frac{1}{4}\right)+\frac{1}{25}\)
\(=\left(\frac{35}{42}+\frac{12}{42}-\frac{5}{42}\right)+\left(\frac{1}{12}+\frac{8}{12}+\frac{3}{12}\right)+\frac{1}{25}\)
\(=\frac{42}{42}+\frac{12}{12}+\frac{1}{25}=1+1+\frac{1}{25}=2\frac{1}{25}\)
7/3+5/6+1/9+11/7+3/14-4/7=(7/3+5/6)+(1/9+3/14)+(11/7-4/7)
19/6+41/126+7/7=283/63
\(a.\frac{7}{3}+\frac{5}{6}+\frac{1}{9}\)
\(=\frac{42}{18}+\frac{15}{18}+\frac{2}{18}\)
\(=\frac{42+15+2}{18}\)
\(=\frac{59}{18}\)
Bài làm :
Ta có :
\(6\frac{5}{3}+7\frac{13}{8}+3\frac{1}{3}-4\frac{5}{8}\)
\(=\left(6\frac{5}{3}+3\frac{1}{3}\right)+\left(7\frac{13}{8}-4\frac{5}{8}\right)\)
\(=\left(\frac{23}{3}+\frac{10}{3}\right)+\left(\frac{69}{8}-\frac{37}{8}\right)\)
\(=\frac{33}{3}+\frac{32}{8}\)
\(=11+4\)
\(=15\)
6/7-1/3+x=5/3
11/21+x =5/3
x =5/3-11/21
x =8/7
vậy x=8/7
kb tích mk nha
\(\frac{6}{7}-\frac{1}{3}+x=\frac{5}{3}\)
\(\frac{18}{21}-\frac{7}{21}+x=\frac{5}{3}\)
\(\frac{11}{21}+x=\frac{5}{3}\)
\(x=\frac{11}{21}-\frac{5}{3}\)
\(x=-\frac{24}{21}\)
\(Kochắcchắn\)
Hk tốt
# MissyGirl #