2,4,10,10通过四则运算和括号的运算使结果等于24。怎么算啊？

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1: (2 + 4 ÷ 10) × 10
2: (2 + (4 ÷ 10)) × 10
3: (4 ÷ 10 + 2) × 10
4: ((4 ÷ 10) + 2) × 10
5: 10 × (2 + 4 ÷ 10)
6: 10 × (2 + (4 ÷ 10))
7: 10 × (4 ÷ 10 + 2)
8: 10 × ((4 ÷ 10) + 2)

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(2 + 4 ÷ 10) × 10
=（2+0.4）×10
= 2.4×10
= 24

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