20-18,6:(6 11/15-4 3/20)= найдите значение выражения по действиям. Created by evgenya2016. matematika-ru

20-18,6:(6 11/15-4 3/20)= 1) 2)3).....................................................................................................................................или3)

20)= найдите значение выражения по действиям...

evgenya2016 @evgenya2016

July 2022 1 1 Report

20-18,6:(6 11/15-4 3/20)= найдите значение выражения по действиям

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uh19

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20-18,6:(6 11/15-4 3/20)=

1) $6\frac{11}{15} -4\frac{3}{20} =\frac{6*15+11}{15} -\frac{4*20+3}{20} =\frac{101}{15} -\frac{83}{20} =\frac{4*101}{4*15} -\frac{3*83}{3*20} =\frac{404}{60} -\frac{249}{60} =\frac{155}{60} =\frac{31}{12} =2\frac{7}{12}$

2) $18.6:2\frac{7}{12} =18\frac{6}{10} :2\frac{7}{12} =\frac{18*10+6}{10} :\frac{2*12+7}{12} =\frac{186}{10} :\frac{31}{12} =\frac{186}{10} *\frac{12}{31} =\frac{2232}{310} =7\frac{1}{5}$

3) $20-7\frac{1}{5} =\frac{20}{1} -\frac{7*5+1}{5} =\frac{20}{1} -\frac{36}{5}=\frac{5*20}{5*1} -\frac{36}{5} =\frac{100}{5} -\frac{36}{5} =\frac{64}{5} =12\frac{4}{5}$

.....................................................................................................................................

или

3) $20-7\frac{1}{5} =20 - 7.2 = 12.8$

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