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解决问题
一（2）班共有42个小朋友，他们打算坐大巴车去游玩。请问，全部小朋友上车后，车上会剩余几个空座位？

$47 + 8 =$ $18 + 9 =$ $37 + 12 =$
$30 + 24 =$ $53 - 43 =$ $78 - 19 =$
$29 + 14 =$ $10 + 32 =$ $8 + 15 =$
$51 - 5 =$ $42 - 4 =$ $31 - 3 =$
$39 + 12 =$ $49 + 20 =$ $29 + 21 =$
$22 - 13 =$ $48 - 11 =$ $78 - 25 =$
$50 + 16 =$ $63 + 23 =$ $11 + 27 =$
$25 - 7 =$ $32 - 26 =$ $34 - 9 =$
$13 + 5 =$ $42 + 32 =$ $31 + 33 =$
$28 + 5 =$ $17 - 8 =$ $29 + 12 =$
$37 - 4 =$ $49 - 16 =$ $28 - 25 =$
$36 + 20 =$ $55 - 20 =$ $67 - 48 =$
$27 + 44 =$ $50 + 23 =$ $13 + 10 =$
$17 + 33 =$ $36 + 10 =$ $60 + 27 =$
$30 + □ = 52$ $□ + 45 = 50$ $□ - 12 = 40$
$□ + 61 = 72$ $43 - □ = 10$ $77 - □ = 9$

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题目给出大巴车的核定载客量为50人，而一（2）班共有42个小朋友。要求计算全部小朋友上车后车上剩余的空座位数。
用核定载客量减去小朋友的总人数即可得到剩余空座位数：
$50 - 42 = 8$