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75x399十75简便法计算

您好.原式 =75x299+75x1 =75x(299+1) =75x300 =22500

原式=75x299+75x1=75x(299+1)=75x300=22500

75x99+75=75(100-1)+75=7500-75+75=7500,第二种提取公因式,=75(99+1)=7500

75x299+75=75*(299+1) =75*300 =22500

75x297十75=75x(297+1)=75x298=75x(300-2)=75x300-75x2=22500-150=22350

75x3十75十75=25*3*3+25*3+25*3=25*(9+3+3)=25*10+25*5=250+125=375

75x99+2x75简便计算.=75*(99+2)=75*101=7575

75*399+75=75*(399+1)=75*400=30000

应该是:75x299十75 吧75x299十75 =75*299+75*1 =75*(299+1) =75*300 =22500

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