Упростить: a 5/6*b7/12*a3/4* b 2/3

[latex]a \frac{5}{6} *b \frac{7}{12} *a \frac{3}{4} * b \frac{2}{3} , a* \frac{5}{3}b* \frac{7}{12} a* \frac{1}{4} b, \frac{35}{144} a^{2} b^{2} [/latex]