直接写得数。+=÷=2.8×=4.01×0.01＝10﹣2.7＝0.22＝

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$\text{[math]}$ + $\text{[math]}$ =	$\text{[math]}$ ÷ $\text{[math]}$ =	2.8× $\text{[math]}$ =
4.01×0.01＝	10﹣2.7＝	0.2²＝

1. (2024·威县) 直接写得数。+=÷=2.8×=4.01×0.01＝10﹣2.7＝0.22＝