袋,能正好装完吗?为什么?
2.4×0.3= 8.2÷0.01= 4a+a= 12.6-7.6+0.4= 3.6+0.04= 1.1-0.11= 7a×a= 1.25×8÷1.25×8=
+ = 2- = + = - =
-2= + = - = 1- =
估算:
计算: