下面数学表达式赋值正确的是( )。
int a = 3, b = 4, c = 5, d; d = a * b + c;
int a = 6, b = 9, c = 3, d; d + c = a * b;
int a = 2, b = 1, c = 4, d; c/a= b * d;
int a = 3, b = 4, c=15, d; a* b = c - d;
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