49×49+49×(40+6)×25简便
问题描述:
49×49+49×(40+6)×25简便
答
49(49+(40+6)25) =49(25×2-1+(40+6)25) =49[25(2+40+6)-1] =49(1200-1) =58800-49 =58751
49×49+49×(40+6)×25简便
49(49+(40+6)25) =49(25×2-1+(40+6)25) =49[25(2+40+6)-1] =49(1200-1) =58800-49 =58751