\(\frac{1985.1987-1}{1980+1985.1986}=\frac{3944194}{3944190}\)
\(\frac{3944194}{3944190}>1\)
=> \(\frac{1985.1987-1}{1980+1985.1986}>1\)
1985*1987-1
=3944195-1
=\(\frac{3944194}{1}\)
\(\frac{3944194}{1}\)>1
1980+1985*1960
=1980+3890600
=1<\(\frac{3892580}{1}\)