一、 直接写出得数（20分）
17 – 8 = 11– 3 = 24 + 5 = 60 + 22 –2 =
41 + 20 = 7 + 62 = 68 – 5 = 78 – 50 + 30 =
89 – 7 = 6 + 8 = 16－9 = 65 –60+ 80 =
90 – 10= 50 + 38 = 54 – 40 = 78 – 5 – 30 =
29 + 40 = 15 – 8 = 30 + 60 = 32+ 50 –40 =
