เฉลย สำ�หรับครู -5 1) (3 + 6) -5 (3 + 6) = 9 -5 = 1 9 5 หรือ = 1 3 10 2) (2 - 5) -4 -4 (2 - 5) = (-3) -4 = 1 4 (-3) 1 = 4 3 3) {1 + (2 + 1) { 2 0 {1 + (2 + 1) { = {1+(3) { 2 0 2 0 = 10 0 = 1 2 4) 3 Ö 125 3 2 3 3 Ö 125 5 2 = 3 Ö 5 5 3 5 3 = 3 2 6