A.537-200-2 | B.537+200-2 | C.537-200+2 |
A.327-268+32=327-(268+32) | B.430-297=430-300-3 | C.223+401+73=(223+73)+401 |
A.加法交换律 | B.加法结合律 | C.加法交换律和加法结合律 |
A.少1 | B.少2 | C.多2 |
A.+ | B.- |
A.8.42 | B.15 | C.1524 | D.28.2 |
A.34+89+11=34+(89+11) |
B.38+19=19+38 |
C.194+39+86=39+(194+86) |
A.5+15="15+5" | B.89+68+32=89+(68+32) |
C.12×5=5×12 | D.77×4×25=77×(4×25) |
A.2932-200-98 | B.2932-300-98 |
C.2932-300+2 | D.2932-300-2 |