450÷20+1.9×43
=22.5+(2-0.1)x43
=22.5+86-4.3
=86+18.2
=104.2
450÷20+1.9×43 =22.5+(2-0.1)x43 =22.5+86-4.3 =86+18.2 =104.2
450除以20+1.9乘43
=45除以2+（2-0.1）乘43
=45/2+86-4.3
=45/2+71.7
=22.5+71.7
=94.2
450÷20+1.9×43=22.5+81.7=104.2 已是最简
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