[8.2-5*(0.5+0.9)]/0.03怎么算

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[8.2-5*(0.5+0.9)]/0.03怎么算
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[8.2-5*(0.5+0.9)]/0.03怎么算
[8.2-5*(0.5+0.9)]/0.03怎么算

[8.2-5*(0.5+0.9)]/0.03怎么算
[8.2-5×(0.5+0.9)]÷0.03
=(8.2-5×1.4)÷0.03
=(8.2-7)÷0.03
=1.2÷0.03
=40

=(8.2-5×1.7)/0/03
=(8.2-7)/0.03
=1.2/0.03
=40