412*81+11*925+537*19求积

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412*81+11*925+537*19求积

412*81+11*925+537*19求积
412*81+11*925+537*19
求积

412*81+11*925+537*19求积
412×81+11×925+537×19 =412×81+10×925+925+412×19+125×20-125 =412×(81+19)+(9250+925+2500-125)=412×100+12550 =41200+12550 =53750
412×81+11×925+537×19
=412×81+11×925+(412+125)×19
=412×(81+19)+11×(800+125)+125×(20-1)
=41200+8800+11×125+125×20-125
=50000+10×125+20×125
=50000+1250+2500
=53750