①7.217.212 4.9334.93 2.8÷0.62.8 0.45×1.050.45
3.5×0.1= 43÷0.1= 200×0.04= 12-1.2= 1.3×0.5=
0.42÷0.6= 6.3÷0.7= 0.21×0.3= 5.69÷0.5= 5.5÷11=