一 口算(8分)
65 - 24 = 66 - 16 = 77 - 34 = 93 - 61 =
85 - 25 = 5 5- 14 = 67 - 56 = 56 - 9 =
42 + 9= 43 + 3 = 48 + 4 = 25 + 3 =
35 + 4= 23 + 9 = 3×5 = 9 + 26 =
25 + 5 = 24 + 7 = 24 + 6 = 38 + 7 =
2×1= 53 - 20 = 45 - 20 = 43 - 21 =
59 - 44 = 3×3 = 36 - 14 = 87 - 77 =
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