ถูกต้อง: -5, -8, -9, -2-5, (-6)+(-1), -5-6, 1+(-5), -1-2-3, 3-10, -2+1, 2+(-9), (-30)-(-25), -8-20-5, (-11)+10-5, (1-2)-3, (5-8)-4, [(-8)-(-6)]-2, [(-4)-5]-1, (-4)-3, (-6)-5, ไม่ถูกต้อง: 7, 2.5, 8, 1.25, 5-1, 10+(-5), -10+20, -6+6, -(-7), 0-(-8), 10.5, 20-(-20), 10-4, 5-5+10-6, 40-(-2), -35+35, (-15)-(-25), [(-9)+10]-(-2), [10-(-3)]-1, (41-80)+(-5),

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