一、口算。
$14 - 8 =$ $9 + 26 =$ $7 + 89 =$
$50 + 21 =$ $7 + 5 =$ $26 - 9 =$
$60 - 30 =$ $43 - 8 =$ $47 + 40 =$
$38 + 5 =$ $78 + 7 =$ $55 - 7 =$
$86 - 80 =$ $95 - 20 =$ $69 + 2 =$
$6 + 9 =$ $26 + 60 =$ $54 - 6 =$
$34 - 7 =$ $78 - 30 =$ $48 + 2 =$
$70 + 20 =$ $79 + 8 =$ $81 - 7 =$
$52 - 6 =$ $80 - 50 =$ $62 + 30 =$
$77 + 5 =$ $9 + 68 =$ $45 + 6 =$

一、6 35 96
71 12 17
30 35 87
43 85 48
6 75 71
15 86 48
27 48 50
90 87 74
46 30 92
82 77 51

二、在$□$里填合适的数。

二、56 16 24 33
78 72 32 40
9 43 39 59