1.递增/递减运算符等价式

a=b++; <=> a=b;b=b+1;
a=++b; <=> b=b+1;b=b;
a=b--;   <=> a=b;b=b-1;
a=--b;   <=> b=b-1;b=b;

所以，a=5;b=6;var3=a++*--b，结果为25

2.带操作的赋值运算符等价式

a*=b;  <=> a=a*b;
a/=b;   <=> a=a/b;
a+=b;  <=> a=a+b;
a-=b;   <=> a=a-b;
a%=b; <=> a=a%b;
a&=b;  <=> a=a&b; //从&=开始，下边都是逐位运算符
a|=b;   <=> a=a|b;
a^=b;  <=> a=a^b;
a>>=b;  <=> a=a>>b;
a<<=b;  <=> a=a<<b;
a>>>=b;  <=> a=a>>b; //C#没有此运算符