递等式计算(尽量简便)17.8-20.4×25%×16-13÷9+×4 ×2.4+6.6×87.5%+1÷

1. (2023六上·杭州期末) 递等式计算(尽量简便)
17.8-20.4× $\text{[math]}$ 25%× $\text{[math]}$
16-13÷9+ $\text{[math]}$ ×4 $\text{[math]}$ ×2.4+6.6×87.5%+1÷ $\text{[math]}$

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17.8-20.4× $\text{[math]}$	25%× $\text{[math]}$
16-13÷9+ $\text{[math]}$ ×4	$\text{[math]}$ ×2.4+6.6×87.5%+1÷ $\text{[math]}$

1. (2023六上·杭州期末) 递等式计算(尽量简便)17.8-20.4×25%×16-13÷9+×4 ×2.4+6.6×87.5%+1÷