口算题.3×3.14= 0.32= == = 11×3.14== 4.52= 25﹣8.6== =
计算下面各题. .
= × ==.
口算显身手.×2= ×= =12﹣= ×= 1×=×0= 3×= ×=
口算题.×12= ×=60×= ×=