Trắc nghiệm Bài tập cơ bản Hỗn số có đáp án

$12\frac{5}{9}=12+\frac{5}{9}=\frac{12\times 9+5}{9}=\frac{113}{9}$

$5\frac{3}{7}=5+\frac{3}{7}=\frac{5\times 7+3}{7}=\frac{38}{7}$

$7\frac{2}{5}=7+\frac{2}{5}=\frac{7\times 5+2}{5}=\frac{{\displaystyle 37}}{{\displaystyle 5}}$

$9\frac{4}{9}=9+\frac{4}{9}=\frac{9\times 9+4}{9}=\frac{{\displaystyle 85}}{{\displaystyle 9}}$

$7\frac{1}{8}+6\frac{3}{4}=\frac{57}{8}+\frac{27}{4}=\frac{57}{8}+\frac{54}{8}=\frac{57+54}{8}=\frac{{\displaystyle 111}}{{\displaystyle 8}}$

$3\frac{1}{2}+4\frac{3}{8}=\frac{7}{2}+\frac{35}{8}=\frac{28}{8}+\frac{35}{8}=\frac{28+35}{8}=\frac{63}{8}$

$4\frac{2}{5}-3\frac{1}{5}=\frac{22}{5}-\frac{16}{5}=\frac{22-16}{5}=\frac{6}{5}$

$1\frac{1}{6}-1\frac{1}{7}=\frac{7}{6}-\frac{8}{7}=\frac{49}{42}-\frac{48}{42}=\frac{49-48}{42}=\frac{1}{42}$

$3\frac{1}{7}\times 4\frac{3}{11}=\frac{22}{7}\times \frac{47}{11}=\frac{22\times 47}{7\times 11}=\frac{1034}{77}=\frac{{\displaystyle 94}}{{\displaystyle 7}}$

$2\frac{1}{8}\times 3\frac{2}{7}=\frac{17}{8}\times \frac{23}{7}=\frac{17\times 23}{8\times 7}=\frac{{\displaystyle 391}}{{\displaystyle 56}}$

$3\frac{2}{7}÷4\frac{1}{5}=\frac{23}{7}÷\frac{21}{5}=\frac{23}{7}\times \frac{5}{21}=\frac{{\displaystyle 115}}{{\displaystyle 147}}$

$4\frac{5}{6}÷3\frac{1}{2}=\frac{29}{6}÷\frac{7}{2}=\frac{29}{6}\times \frac{2}{7}=\frac{58}{42}=\frac{{\displaystyle 29}}{{\displaystyle 21}}$

$7\frac{6}{3}-7\frac{6}{7}=\frac{27}{3}-\frac{55}{7}=\frac{189}{21}-\frac{165}{21}=\frac{189-165}{21}=\frac{24}{21}=\frac{8}{7}$

$9\frac{3}{4}-5\frac{3}{5}=\frac{39}{4}-\frac{28}{5}=\frac{195}{20}-\frac{112}{20}=\frac{195-112}{20}=\frac{{\displaystyle 83}}{{\displaystyle 20}}$

$3\frac{3}{8}\times 4\frac{2}{5}=\frac{27}{8}\times \frac{22}{5}=\frac{27\times 22}{8\times 5}=\frac{594}{40}=\frac{297}{20}$

$3\frac{2}{7}÷1\frac{3}{8}=\frac{23}{7}÷\frac{11}{8}=\frac{23}{7}\times \frac{8}{11}=\frac{184}{77}$

$8\frac{1}{13}+7\frac{9}{13}=\frac{105}{13}+\frac{100}{13}=\frac{105+100}{13}=\frac{{\displaystyle 205}}{{\displaystyle 13}}$