(1)(25+2)×4 =25×4+2×4 =100+8 =108 (2)126×5+5×74 =(126+74)×5 =200×5 =1000 (3)13×99+13 =13×(99+1) =13×100 =1300 (4)615-(134-85) =615-134+85 =615+85-134 =700-134 =566 (5)25×(15×4) =25×4×15 =100×15 =1500