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252.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;  <=&g...