计算题,超难的.

1.(2又2/9*4/5+2又2/9+6.2-5.8*2又2/9-1/5*2又2/9)*9/20
=[2又2/9*(1+4/5)-2又2/9*(5.8+1/5)+6.2]*9/20
=[20/9)*(9/5)-(20/9)*6+6.2]*9/20
=1.8-6+124
=119.8
2、1/2+5/6+11/12+19/20+29/30+……+9701/9702+9899/9900
=1-1/2+1-1/6+...+1-1/9900
=1*99-(1-1/2+1/2-1/3+...+1/99-1/100)
=99-(1-1/100)
=99-1+1/100
=9801/100