319053的文章精选

3.19+0.53×1.6简便计算：3.19+0.53×1.6=3.19+0.5×1.6+0.03×1.6=3.19+0.8+0.048=3.99+0.048=4.038。也可以这样简算：3.19+0.53×1.6=3.19+0.53×1+0.53×0.6=3.19+0.53+0.318=3.72+0.318=4.038。计算的定义有许多种使...