简便运算 (1)3.7×99+3.7 (2)+- (3)5.93+0.64+0.07+0.36
1.8×8.6+1.8×1.3+18%
100﹣98+96﹣94+92﹣90+…+76﹣74+72=
11+192+193+19994+199995=
=