7/19 . 1/3 + 7/19 . 2/3 =7/19 .(1/3 + 2/3)= 7/19 . 1 = 7/19

7/19x⅓+7/19x2/3

a)3/5x5/3x8/27=1x8/27=8/27

b)7/19x(1/3+2/3)=7/19x1=7/19

\(\frac{3}{5}x\frac{8}{27}x\frac{5}{3}=\frac{3}{3}x\frac{5}{5}x\frac{8}{27}=\frac{8}{27}\)

\(\frac{7}{19}x\frac{1}{3}+\frac{7}{19}x\frac{2}{3}=\frac{7}{19}x\left(\frac{1}{3}+\frac{2}{3}\right)=\frac{7}{19}\)

A)3/5x8/27x5/3

=8/27x(3/5x5/3)

=8/27x1

=8/27

B)7/19x1/3+7/19x2/3

=7/19x(1/3+2/3)

=7/19x1

=7/19

sai thì thông cảm cho cho mk nhé, có hứng thì kb luôn

\(=\dfrac{2}{5}\cdot\dfrac{7}{3}\cdot\dfrac{3}{7}\cdot\dfrac{5}{2}+2020=1+2020=2021\)

\(\dfrac{7}{19}\times\dfrac{1}{3}+\dfrac{7}{13}\times\dfrac{2}{3}\)

\(=\dfrac{7}{19}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)

\(=\dfrac{7}{19}\times1\)

\(=\dfrac{7}{19}\)

=(3/4+16/4)+(5/7+2/7)-2

=(3/4+1/4)+(5/7+2/7)-2

= 1+1-2

=0

7/19x(1/3+2/3)

=7/19x1

=7/19

NHỚ K CHO MÌNH NẾU ĐÚNG NHÉ

= 7/19x(1/3+2/3)

= 7/19x1

= 7/19

:)))))))

=3/5*\((\)2/7+4/7\()\)+2/5

=3/5*6/7+2/5

=18/35+2/5

=32/35

= 7/5×(5/3 - 1/3 + 2/3 - 3/3)

= 7/5 × 1

= 7/5

lx

Uả cái j zị

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