小學(xué)生二年級數(shù)學(xué)口算題：兩位數(shù)的加減法

51 - 27 = 64 + 76 = 70 - 44 =
     32 + 81 = 60 - 46 = 83 + 41 =
     89 - 51 = 63 + 48 = 34 - 14 =
     66 - 42 = 57 - 33 = 89 + 79 =
     27 + 29 = 73 + 93 = 75 + 45 =
     62 - 40 = 85 - 67 = 66 - 40 =