Question

tính nhanh \(A=\frac{1717}{1919}\times\frac{303}{1818}+\frac{17}{19}\times\frac{1515}{1818}\)

Answer 1

\(A=\frac{17}{19}x\frac{1}{6}+\frac{17}{19}x\frac{5}{6}\)

     \(=\frac{17}{19}x\left(\frac{1}{6}+\frac{5}{6}\right)=\frac{17}{19}x1=\frac{17}{19}\)

Answer 2

A= \(\frac{1717}{1919}\text{ *}\frac{303}{1818}+\frac{17}{19}\text{ *}\frac{1515}{1818}\)

A= \(\frac{17}{19}\text{ *}\frac{3}{18}+\frac{17}{19}\text{ *}\frac{15}{18}\)

A= \(\frac{17}{19}\text{ *}\left(\frac{3}{18}+\frac{15}{18}\right)\)

A= \(\frac{17}{19}\text{ *}1\)

A= \(\frac{17}{19}\)

Vậy A= \(\frac{17}{19}\)

vVv Học tốt nhé bạn, mình sẽ rất vui nếu bạn k đúng cho mình, cảm ơn ban nhiều vVv

Answer 3

\(\frac{1717}{1919}x\frac{303}{1818}+\frac{17}{19}x\frac{1515}{1818}\)

= \(\frac{17}{19}x\frac{1}{6}\)+ \(\frac{17}{19}x\frac{5}{6}\) 

= \(\frac{17}{19}\)x ( \(\frac{1}{6}+\frac{5}{6}\))

= \(\frac{17}{19}x1\)

= \(\frac{17}{19}\)