1)Tính 3/5+3/4÷4/7 1/2+1/3+1/15 1/2-1/4+1/6 7/3+4/3-2/7 2/5+1/15+3/10 25/27+3/7+4/7+2/27 6 1/5×1 2/3÷2

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1. Đáp án:

    

   Giải thích các bước giải:

   3/5+3/4:4/7 =3/5+21/16=153/8

   1/2+1/3+1/15=5/6+1/15=9/10

   1/2 -1/4+1/16 =1/4+1/16 =5/16

   7/3+4/3-2/7=11/3-2/7=71/21

   2/5+1/15+3/10=7/15+3/10=23/30

   25/27+3/7+4/7+2/27=(25/27+2/27)+(3/7+4/7) =1+1=2

   6 1/5×1 2/3÷2 = 31/3:2= 31/6

   Xin câu trl hay nhất ạ

    

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2. $\frac{3}{5}$ + $\frac{3}{4}$ : $\frac{4}{7}$ = $\frac{3}{5}$ + $\frac{21}{16}$

   = $\frac{153}{80}$

   $\frac{1}{2}$ + $\frac{1}{3}$ + $\frac{1}{15}$= $\frac{5}{6}$ + $\frac{1}{15}$

    = $\frac{9}{10}$

   $\frac{1}{2}$ – $\frac{1}{4}$+ $\frac{1}{6}$= $\frac{1}{4}$ + $\frac{1}{6}$

   = $\frac{5}{12}$

   $\frac{7}{3}$ + $\frac{4}{3}$ – $\frac{2}{7}$= $\frac{11}{3}$ – $\frac{2}{7}$

   = $\frac{71}{21}$

   $\frac{2}{5}$ + $\frac{1}{15}$ + $\frac{3}{10}$= $\frac{7}{15}$ + $\frac{3}{10}$

   = $\frac{23}{30}$

   $\frac{25}{27}$ + $\frac{3}{7}$ + $\frac{4}{7}$ + $\frac{2}{27}$=( $\frac{25}{27}$ + $\frac{2}{27}$ ) + ( $\frac{3}{7}$ +  $\frac{4}{7}$ )

   = 1 + 1

   = 2

   6 $\frac{1}{5}$ × 1 $\frac{2}{3}$ : 2= $\frac{31}{5}$ × $\frac{5}{3}$ : 2

   = $\frac{31}{3}$ : 2

   = $\frac{31}{6}$

                     

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