热的
2÷0.25-0.25÷2=2X4-(1/4)÷2=8-1/8=7又8分之7
12.5×﹙0.4-0.08﹚×2.5,把12.5和2.5同时分配进去=12.5×0.4×2.5-12.5×0.08×2.5 =12.5×﹙0.4×2.5﹚-﹙12.5×0.08﹚×2.5 =12.5-2.5 =10