a) \(=\left(-\dfrac{3}{4}+\dfrac{2}{5}\right)\times\dfrac{7}{3}+\left(\dfrac{3}{5}+-\dfrac{1}{4}\right)\times\dfrac{7}{3}\)
\(=\dfrac{7}{3}\times\left(-\dfrac{3}{4}+\dfrac{2}{5}+\dfrac{3}{5}+-\dfrac{1}{4}\right)\)
\(=\dfrac{7}{3}\times\left(-1+1\right)\)
\(=\dfrac{7}{3}\times0=0\)
`(-3/4 + 2/5) : 3/7 + (3/5 + -1/4) : 3/7`
`=(-3/4 + 2/5) xx 7/3 + (3/5 + -1/4) xx 7/3`
`= (-3/4 + 3/5 + 2/5 + -1/4) xx 7/3`
`= 0 xx 7/3`
`= 0`
(−34+25):37+(35+−14):37(-34+25):37+(35+-14):37
=(−34+25)×73+(35 +−14)×73=(-34+25)×73+(35 +-14)×73
=(−34+35 +25+−14)×73=(-34+35 +25+-14)×73
=0×73=0×73
=0