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1) 210*1800 + 1800*210
2) (650 * 100 ) : 100
3) ( 72000:800 ) * 90
1) 210*1800 + 1800*210
2) (650 * 100 ) : 100
3) ( 72000:800 ) * 90
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2. 650*100:100=650
3. 72000:800=90*90=8100
2)650*(100:100)=650*1=650
3)(72000:800)*90=90*90=810