ถูกต้อง: 10 - (-3) = 13, 2 - (-6) = 8, (-4) - 4 = -8, (-24) - 1 = -25, (-5) - (-25) = 20, 11 - 21 = -11, (-2) - 7 = -9, (-6) - (-34) = 28, -4 - 17 = -21, -13 - (-21) = 8, -1 - 16 - 0 = -17, 12 - 4 = 12 + (-4), -2 - 6 = -2 + (-6), 0 - (-8) = 8, ไม่ถูกต้อง: 12 - (-5) = 7, 5 - (-9) = 4, 10 - (-10) = 0, (-20) - 2 = 22, (-15) - (-5) = 10, 54 - 19 = 63, (-2) - 8 = -6, (-33) - (-27) = 60, -7 - 14 = 21, -22 - (-11) = 11, 0 - (-24) = -24 - 0, 12 - 6 = 6 - 12, 20 - 4 = 20 + 4, 0 -18 = 18,

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