12.54+7.46
50-8.6
12.882x100
784.5/100
542.951/10
3.20x10
3.20x100
3.20x1000
3.20x10000
75.8x10
75.8x100
75.8x1000
75.8x10000
1.0x10
1.0x100
1.0x1000
1.0x10000
68.5x10
68.5x100
68.5x1000
68.5x10000
54.5x45.5
12.55689x10000
1999.118x100
1.要100道小数口算题.2.其中加减乘除每一种都要有.