1-2+3-4.+99-100+101 9.99*9.99+1.99= = = =请列示

1-2+3-4.+99-100+101 9.99*9.99+1.99= = = =请列示
1-2+3-4.+99-100+101 9.99*9.99+1.99
= =
= =
请列示

1-2+3-4.+99-100+101 9.99*9.99+1.99= = = =请列示
1.每两项为一组.
可得：101+50=151
2.（1-0.01）^2+2-0.01=1+0.0001-0.02+2-0.01=2.9701