1)-0,5*y*6x^3
2)100*(-2/5)*a^(6+2+1)*b^(3+4)=-40*a^9*b^7
3) 0,125*(-8)*m^(3+5)*n^(1+1)*k^2=1*m^8*n^2*k^2=m^8*n^2*k^2
4)-1,5*6*a^(5+1)*b^(3)*c^(2+7)=-9*c^9*a^6*b^3
