Помогите! решите 4 5 6 7 8 номера! спасибо!

=(-10/3*19/10+39/2*8/33):(4/25-62/75)=(-19/3+52/11):(12/75-62/75)=(-209/33+156/33):(-2/3)=-53/33*(-3/2)=53/22=2 9/22 ------------------------------------------ =(-24/11*33/8+8/5*15/4)/(9-35/6*18/7)=(-3*3+2*3)/(9-5*3)=-3/(9-15)=-3/-6=1/2 ------------------------------------ =(-55/24*6/11+12/25)/(-19/2:(1 245/350-120/350))=(-5/4+12/25)/(-19/2:1 5/14)=(-125/100+48/100)/(-19/2*14/19)=(-77/100)/-7=-77/100*(-1/7)=11/100 -------------------------------- =(-0,4*(-2+5/6*9/10))/(-48+26)=(-0,4(-2+0,75))/-22=(-0,4*(-1,25))/-22=0,5/-22=1/2*(-1/22)=-1/44 ----------------------------------------- -8 1/2*1 3/17+(1 60/46-1 45/46):30/23=-17/2*20/17+15/46*23/30=-10+1/4=-9 3/4