问题 解答题 3.21×23=3.21×2.3=321×2.3=32.1×0.23=3.21×0.23=321×0.023= 答案 3.21×23=73.833.21×2.3=7.383321×2.3=738.332.1×0.23=7.3833.21×0.23=0.7383321×0.023=7.383