[1.9+(0 6.9-0.84)除以0.6]×4.5

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[1.9+(0 6.9-0.84)除以0.6]×4.5
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[1.9+(0 6.9-0.84)除以0.6]×4.5
[1.9+(0 6.9-0.84)除以0.6]×4.5

[1.9+(0 6.9-0.84)除以0.6]×4.5
[1.9+(6.9-0.84)除以0.6]×4.5
=[1.9+6.06除以0.6]×4.5
=[1.9+10.1]×4.5
=12×4.5
=54

[1.9+(0 6.9-0.84)除以0.6]×4.5
=(1.9-0.25)×4.5
=7.425