Question

tính bằng cách thuận tiện;

a.3/5x8/27x5/3.

b/7/19x1/3+7/19x2/3.

Answer 1

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

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

Answer 2

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

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

Answer 3

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

Answer 4

a) 3/5 x 8/27 x 5/3

= 3/5 x 5/3 x 8/27

= 1 x 8/27

= 8/27

câu b tương tự

Answer 5

a, 3/5 x 8/27 x 5/3

= ( 3/5 x 5/3 ) x 8/27 

= 1 x 8/27 

= 8/27

b, 7/19 x 1/3 + 7/19 x 2/3

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

= 7/19 x  1

= 7/19