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result1 = a+b+c+d; 直接算, a+b+c+d = 40;result2 = a+c%b; 先算,c%b = 20%4 = 0, 所a+c%b = 10
result3 = a++ *b + c* --d; a*b + c*(d-1)= 10*4 + 20*5 =140
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