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解:2.11 + 1.89 ÷ 0.54
= (2×100 + 11)/100 + (1×100 + 89)/100 ÷ 54/100
= 211/100 + 189/100 × 100/54
= 211/100 + 189/54
= 211/100 + 7/2
= 211/100 + 350/100
= 561/100
= 5.61
= (2×100 + 11)/100 + (1×100 + 89)/100 ÷ 54/100
= 211/100 + 189/100 × 100/54
= 211/100 + 189/54
= 211/100 + 7/2
= 211/100 + 350/100
= 561/100
= 5.61
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