1. 直接写出得数。
$24 + 45 =$ $56 + 35 =$ $170 - 90 =$
$64 - 42 =$ $60 + 80 =$ $1500 - 700 =$
$24 + 45 =$ $56 + 35 =$ $170 - 90 =$
$64 - 42 =$ $60 + 80 =$ $1500 - 700 =$
答案:
2. 算一算,比一比。

答案:
3. 用竖式计算,并验算。
$503 - 107 =$ $389 - 298 =$
$503 - 107 =$ $389 - 298 =$
答案:
4. $276 + 154 + 288 =$ $712 - 356 - 237 =$
答案:
查看更多完整答案,请扫码查看