一、口算。
$75 + 5 =$ $43 - 40 =$ $28 + 9 + 30 =$
$11 - 2 =$ $8 + 8 =$ $64 - 7 + 20 =$
$60 + 23 =$ $51 - 6 =$ $38 + 3 - 8 =$
$81 - 50 =$ $4 + 77 =$ $48 - 9 - 20 =$
$37 + 6 =$ $50 - 3 =$ $60 + 15 - 7 =$
$21 - 2 =$ $56 + 9 =$ $48 + 7 + 40 =$
$30 + 40 =$ $27 + 50 =$ $83 - 6 - 5 =$
$94 - 7 =$ $76 - 60 =$ $67 - 8 + 20 =$
$68 + 3 =$ $50 + 19 =$ $42 + 9 - 40 =$
$82 - 70 =$ $73 - 4 =$ $57 - 40 + 8 =$

一、80 3 67
9 16 77
83 45 33
31 81 19
43 47 68
19 65 95
70 77 72
87 16 79
71 69 11
12 69 25

二、找规律，填数。

二、24 52 39 50