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-30 * 3 + 21 / 5

-90 + 4 = -86

-30 + 3 * 21 / 5

-30 + 63 / 5 = -30 + 12 = -18

30 / 3 * 21 % 5

10 * 21 % 5 = 210 % 5 =0

-30 / 3 * 21 % 4

-10 * 21 % 4 = -210 % 4 = - (210 % 4) = -2

（C++11中规定-m % n = - (m%n)）