Dear student,
1. (3/5)*(35/24+10/27)
=(3/5)*(5/3*7/8+5/3*2/9)
=(3/5)*(5/3)(7/8+2/9) [a*(b+c)=a*b+a*c]
=1((63+16)/72)
= 79/72
2.(-2/5)*(3/4)+(5/7)*(-3/4)*(1/5)
=(3/4)[-2/5-(5/7)(1/5)]
=(3/4)[-2/5-1/7]
=(3/4)[(-14-5)/35]
=(3/4)(-19/35)
=-57/140
Regards