Question

Tính hợp lí:

A= -5/7 x 2/11 + -5/7 x 9/11 +1/5/7 

kb với mk nha

Answer 1

A=-5/7x2/11+-5/7x9/11+1+5/7

A=5/7x-2/11+5/7x-9/11+1+5/7

A=5/7x[-2/11+-9/11+1]+1

A=5/7x0+1

A=0+1

A=1

Answer 2

lí luận rõ ra nhé

Answer 3

A=\(\frac{-5}{7}\)x  \(\frac{2}{11}\)+  \(\frac{-5}{7}\)x  \(\frac{9}{11}\) +   \(1\frac{5}{7}\)

A= \(\frac{-5}{7}\)x (\(\frac{2}{11}\)+   \(\frac{9}{11}\)) +  \(\frac{12}{7}\)

A=  \(\frac{-5}{7}\)x 1 + \(\frac{12}{7}\)

A=  \(\frac{-5}{7}\)+    \(\frac{12}{7}\)

A=  1

Answer 4

\(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+\frac{7}{5}\)

\(=\frac{-5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{7}{5}\)

\(=\frac{-5}{7}.1+\frac{7}{5}=\frac{-5}{7}+\frac{7}{5}=\frac{24}{35}\)