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App Inventor 2 数学积木完全指南：从加减乘除到位运算，一篇搞定所有计算...
...记住这个区别：
- 求模(modulo)：结果与除数 b 同号。mod(-11, 5) = 4
- 余数(remainder)：结果与被除数 a 同号。remainder(-11, 5) = -1
- 商(quotient)：整除结果，丢弃小数部分
表达式求模余数(11, 5)11(-11, 5)4-1(11, -5)-41(-11, -5)-1-1
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