请帮我算一下
2024-07-20 19:33:24作者:饭克斯
(8)72÷(4+5)
=72÷9
=8小时
(9)2400÷20-75
=120-75
=45元
(10)(54-6×2)÷(6+15)
=(54-12)÷21
=42÷21
=2小时
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2024-07-20 19:33:24作者:饭克斯
(8)72÷(4+5)
=72÷9
=8小时
(9)2400÷20-75
=120-75
=45元
(10)(54-6×2)÷(6+15)
=(54-12)÷21
=42÷21
=2小时