一、口算。
$82 - 5 =$ $7 + 26 =$ $9 + 28 + 8 =$
$72 + 8 =$ $66 - 40 =$ $45 - 6 + 40 =$
$94 - 6 =$ $89 + 10 =$ $78 - 9 - 30 =$
$36 + 7 =$ $41 - 5 =$ $55 + 6 + 20 =$
$5 + 56 =$ $35 + 6 =$ $26 - 8 + 50 =$
$66 - 8 =$ $90 - 4 =$ $29 + 10 + 4 =$
$84 - 20 =$ $47 + 8 =$ $33 - 9 + 40 =$
$41 + 50 =$ $65 - 9 =$ $76 + 8 - 9 =$
$57 - 50 =$ $59 + 6 =$ $91 - 80 - 8 =$
$43 + 7 =$ $94 - 40 =$ $43 - 8 + 40 =$

一、77 33 45
80 26 79
88 99 39
43 36 81
61 41 68
58 86 43
64 55 64
91 56 75
7 65 3
50 54 75

二、算一算，填一填。

二、40 22 25
86 39 46
45 64 62