简便计算(125.6-98.8)+(100-76.5)=(125.6+100)-(98.8+76.5)=225.6-175.3=50.3
(125.6-98.8)+(100-76.5)=125.6-98.8+100-76.5=(125.6-76.5)+(100-98.8)=49.1+1.2=50.3