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\(a,4\dfrac{1}{4}-2=\dfrac{17}{4}-2=\dfrac{9}{4};\dfrac{5}{8}+2\dfrac{3}{5}=\dfrac{5}{8}+\dfrac{13}{5}=\dfrac{129}{40}\\ b,4\dfrac{4}{9}:2=\dfrac{40}{9}\cdot\dfrac{1}{2}=\dfrac{20}{9};\dfrac{2}{3}+3\dfrac{1}{6}=\dfrac{2}{3}+\dfrac{19}{6}=\dfrac{23}{6}\\ c,3\dfrac{1}{5}+2=\dfrac{9}{5}+2=\dfrac{19}{5};\dfrac{3}{5}-2\dfrac{4}{5}=\dfrac{3}{5}-\dfrac{14}{5}=-\dfrac{11}{5}\)
\(d,5\dfrac{1}{7}-2=\dfrac{36}{7}-2=\dfrac{22}{7};\dfrac{4}{5}:1\dfrac{1}{5}=\dfrac{4}{5}:\dfrac{6}{5}=\dfrac{2}{3}\\ e,2\dfrac{3}{5}+1=\dfrac{13}{5}+1=\dfrac{18}{5};\dfrac{1}{4}\cdot2\dfrac{2}{3}=\dfrac{1}{4}\cdot\dfrac{8}{3}=\dfrac{2}{3}\\ f,4\dfrac{1}{3}\cdot1=\dfrac{13}{3};\dfrac{1}{2}+5\dfrac{2}{7}=\dfrac{1}{2}+\dfrac{37}{7}=\dfrac{81}{14}\)
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a/ 3 1 3 - 1 3 4 = 10 3 - 7 4 = 40 12 - 21 12 = 40 - 21 12 = 19 12
b/ 2 5 6 + 1 2 3 = 17 6 + 5 3 = 17 6 + 10 6 = 17 + 10 6 = 27 6 = 9 2
c/ 2 3 8 : 1 3 4 = 19 8 : 7 4 = 19 8 × 4 7 = 19 × 4 8 × 7 = 76 56 = 19 14
d/ 1 3 7 x 1 5 8 = 10 7 × 13 8 = 10 × 13 7 × 8 = 130 56 = 65 28
a/ 24,56 + 451,35 = 475,91
b/ 123,4 - 25,82 = 97,58
c/ 23,15 × 4,2 = 97,23
a) 24,56 + 451,35 = 475,91
b) 123,4 - 25,82 = 97,58
c) 23,15 x 4,2 = 97,23