3 + 2 + 1 =6 3 + 2 + 1 =6 3 + 2 + 1 =6 3 - 2 - 1 =2 3 - 2 - 1 =-4 3 - 2 - 1 =-4 4 + 3 * 2 + 1 =21 4 + 3 * 2 + 1 =11 4 + 3 * 2 + 1 =13 4 + 3 * 2 + 1 =11