42克=千克 4500平方米=公顷
9.56×0.989.56 104×1.01104
38.5÷0.9938.5 420÷1.7420
1.3×4.6= 0.598÷0.13=
2.5×0.4= 1.5×6= 0.72÷9= 2.2×5×0.7=
0.78×0= 0.28÷0.4= 0.3×0.3= 4.8÷0.6÷0.8=
12.6÷3= 0.25÷0.1= 0.64÷0.32= (2.5-1.5)÷0.2=
①36×0.25
②15.58+8.2-0.72
③4.16÷0.4÷2.5
④0.42×102
⑤6.28×8+3.72×8