Bài 1: Thực hiện phép tính a) \(\frac{15}{34}+\frac{7}{21}+\frac{19}{34}-1\frac{7}{21}+2\)
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a/ \(\frac{15}{34}+\frac{7}{21}+\frac{19}{34}-\frac{32}{17}+\frac{14}{21}=\left(\frac{15}{34}+\frac{19}{34}\right)+\left(\frac{7}{21}+\frac{14}{21}\right)-\frac{32}{17}=1+1-\frac{32}{17}=\frac{2}{17}\)
Ta có: \(\frac{15}{34}+\frac{7}{21}+\frac{19}{34}-\frac{36}{21}+\frac{2}{3}\)
\(=\frac{15}{34}+\frac{19}{34}+\frac{7}{21}-\frac{36}{21}+\frac{2}{3}\)
\(=1-\frac{29}{31}+\frac{2}{3}=\frac{2}{31}+\frac{2}{3}=\frac{68}{93}\)
a) \(1\frac{3}{19}+\frac{8}{21}-\frac{3}{19}+0.5+\frac{13}{21}\)
\(=\left(1\frac{3}{19}-\frac{3}{19}\right)+\left(\frac{8}{21}+\frac{13}{21}\right)+0.5\)
\(=1+1+0.5=2.5\)
b) \(\left(-\frac{3}{4}+\frac{2}{7}\right):\frac{3}{7}+\left(\frac{5}{7}+\frac{-1}{4}\right):\frac{3}{7}\)
\(=\left(\frac{-3}{4}+\frac{2}{7}+\frac{5}{7}+\frac{-1}{4}\right):\frac{3}{7}\)
\(=0:\frac{3}{7}=0\)
\(a)=\frac{7}{25}+\frac{4}{13}-\frac{5}{2}+\frac{18}{25}-\frac{17}{13}\)
\(=1-1-\frac{5}{2}\)
\(=-\frac{5}{2}\)
Bài 1 :
\(a,\frac{15}{34}+\frac{7}{21}+\frac{19}{34}-1\frac{7}{21}+2\)
\(=\left(\frac{15}{34}+\frac{19}{34}\right)+\left(\frac{7}{21}-1\frac{7}{21}\right)+2\)
\(=1-1+2\)
\(=2\)
Học tốt
Bài 1 :
a, 15/34+7/21+19/34-1 7/21+2
= 15/34+1/3+19/34-4/3+2
= (15/34+19/34)+(1/3-4/3)+2
= 1+(-1)+2=0+2=2