| 50×50= | 10×20= | 1- = | - = |
| 15×30= | 40×60= | + = | + = |
| 50×50=2500, | 10×20=200, | 1- = , | - = , |
| 15×30=450, | 40×60=2400, | + = , | + = . |
,
,450,2400,
,
.分析:根据整数乘法的计算法则,以及同分母分数加减法的计算法则求解.
点评:本题考查了整数的乘法,以及同分母分数加减法的计算方法,注意乘法乘积末尾0的个数.
编辑:chaxungu时间:2026-04-27 08:46:47分类:小学数学题库
| 50×50= | 10×20= | 1- = | - = |
| 15×30= | 40×60= | + = | + = |
| 50×50=2500, | 10×20=200, | 1- = , | - = , |
| 15×30=450, | 40×60=2400, | + = , | + = . |
,
,450,2400,
,
.