Question

Tính nhanh

\(\frac{3}{5}\times\frac{8}{27}\times\frac{5}{3}\)

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

\(\frac{12}{5}\times4-4\times\frac{7}{5}\)

Answer 1

\(\frac{3}{5}.\frac{8}{27}.\frac{5}{3}=1.\frac{8}{27}.1=\frac{8}{27}\)

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

\(\frac{12}{5}.4-4.\frac{7}{5}=4\left(\frac{12}{5}-\frac{7}{5}\right)=4.1=4\)

Answer 2

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

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

\(=1x\frac{8}{27}\)

\(=\frac{8}{27}\)

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

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

\(=\frac{7}{19}x1=\frac{7}{19}\)

\(\frac{12}{5}x4-4x\frac{7}{5}\)

\(=4x\left(\frac{12}{5}-\frac{7}{5}\right)\)

\(=4x1=4\)

Đúng luôn nên các bn nhớ k mk nhé

Answer 3

A) 3/5 x 8/27 x 5/3

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

= 8/45 x 5/3 

= 8/27

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

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

= 7/57 + 14/57

= 7/19

C) 12/5 x 4 - 4 x 7/5

= ( 12/5 x 4 ) - ( 4 x 7/5 )

= 48/5 - 28/5

= 4

Answer 4

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

=       1            x 8/27

=              8/27

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

= 7/19 x          1

=     7/19

c)( 12/5 - 7/5 ) x 4

 =     1            x 4

=        4