a,\(\dfrac{15}{7}.\dfrac{12}{25}+\dfrac{15}{7}.\dfrac{12}{15}+\dfrac{15}{17}\)
=\(\dfrac{15}{7}.\left(\dfrac{12}{25}+\dfrac{12}{25}+1\right)\)
=\(\dfrac{15}{7}.\dfrac{49}{25}\)
=\(\dfrac{21}{5}\)
b,\(\dfrac{4}{5}+\dfrac{6}{7}-\dfrac{1}{35}\)
=\(\dfrac{28}{35}+\dfrac{30}{35}-\dfrac{1}{35}\)
=\(\dfrac{57}{35}\)
c,\(\left(\dfrac{3}{14}-\dfrac{1}{2}\right):\dfrac{5}{7}\)
=\(\dfrac{-2}{7}:\dfrac{5}{7}\)
=\(\dfrac{-2}{5}\)
a. = 15/17.(12/25+12/25+1)
= = 15/17.(12/25+12/25+25/25)
= 15/17. 49/25
= 147/85
b. = (4/5+6/7) - 1/35
= (28/35+ 30/35) - 1/35
= 58/35 - 1/35 = 56/35= 8/5
c. = (3/14 - 7/14).7/5
= -2/7 . 7/5 = -2/5
