(190*5)*2=190*(5*2)=190*10=1900
5*(630*4)=630*(5*4)=630*20=12600
(639*4)*5=639*(4*5)=639*20=18270
(7250*2)*5=7250*(2*5)=7250*10=72500
(332*4)*5=332*(4*5)=332*20=6640
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