tính
5/8 + 2/3 + 3/7
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\(\dfrac{5}{6}+\dfrac{1}{2}:\dfrac{3}{4}\)
\(=\dfrac{5}{6}+\dfrac{1}{2}\times\dfrac{4}{3}\)
\(=\dfrac{5}{6}+\dfrac{2}{3}\)
\(=\dfrac{5}{6}+\dfrac{4}{6}\)
\(=\dfrac{9}{6}=\dfrac{3}{2}\)
\(5\dfrac{5}{11}-\left(2\dfrac{3}{5}\cdot4\dfrac{6}{11}\right)=\dfrac{60}{11}-\left(\dfrac{13}{5}\cdot\dfrac{50}{11}\right)=\dfrac{60}{11}-\dfrac{130}{11}=-\dfrac{70}{11}\)
\(5xyz-\dfrac{1}{3}xyz+xyz=\left(5-\dfrac{1}{3}+1\right)xyz=\dfrac{17}{3}xyz\)
\(\dfrac{5}{6}-\dfrac{1}{2}\times\dfrac{3}{4}\)
\(=\dfrac{5}{6}-\dfrac{3}{8}\)
\(=\dfrac{20}{24}-\dfrac{9}{24}\)
\(=\dfrac{11}{24}\)
3:
Bước 1: chọn ô
Bước 2: gõ dấu '='
Bước 3: nhập công thức
Bước 4: nhấn enter
5: \(=3-\dfrac{1}{4}+\dfrac{2}{3}-5+\dfrac{1}{3}+\dfrac{6}{5}-6+\dfrac{7}{4}-\dfrac{3}{2}\)
\(=3-5-6+\dfrac{-1}{4}+\dfrac{7}{4}+\dfrac{2}{3}+\dfrac{1}{3}+\dfrac{6}{5}-\dfrac{3}{2}\)
\(=-8+\dfrac{3}{2}+1+\dfrac{-3}{10}\)
\(=-7+\dfrac{15-3}{10}=-7+\dfrac{6}{5}=-\dfrac{29}{5}\)
6: \(=6-\dfrac{2}{3}+\dfrac{1}{2}-5-\dfrac{5}{3}+\dfrac{3}{2}-3+\dfrac{7}{3}-\dfrac{5}{2}\)
\(=6-5-3-\dfrac{2}{3}-\dfrac{5}{3}+\dfrac{7}{3}+\dfrac{1}{2}+\dfrac{3}{2}-\dfrac{5}{2}\)
\(=-2-\dfrac{1}{2}=-\dfrac{5}{2}\)
7: \(=\dfrac{5}{3}-\dfrac{3}{7}+9-2-\dfrac{5}{7}+\dfrac{2}{3}+\dfrac{8}{7}-\dfrac{4}{3}-10\)
\(=9-2-10+\dfrac{5}{3}+\dfrac{2}{3}-\dfrac{4}{3}+\dfrac{-3}{7}-\dfrac{5}{7}+\dfrac{8}{7}\)
=-3+1
=-2
8: \(=8-\dfrac{9}{4}+\dfrac{2}{7}+6+\dfrac{3}{7}-\dfrac{5}{4}-3-\dfrac{2}{4}+\dfrac{9}{7}\)
\(=8+6-3+\dfrac{2}{7}+\dfrac{3}{7}+\dfrac{9}{7}-1-\dfrac{2}{4}\)
\(=11+2-1-\dfrac{1}{2}\)
=11+1/2
=11,5