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78x46 78x54简便计算

78x46+78x54=(46+54)x78=100x78=7800

原式=76*(100+2)+78*(54+46)=76*100+76*2+78*100=(76+78)*100+76*2=154*100+152=15400+152=15552

解:原式=78*(45+54+1) =78*100 =7800

原式=8*46+70*54+8*54=8*100+70*54=4580

53x78+78+78x46=78x(53+1+46)=78x(54+46)=78x100=7800

76x102+78x46+78x54=76x(100+2)+78x(46+54)=7600+152+7800=15400+152=15552

278x46+78x54=278x(46+54)=278x100=27800

46x78+78x56=78x(46+56)=78x(100+2)=78x100+78x2=7800+156=7956 答题不易,望采纳!!!

78x46十78x54=78*(46+54)=78*100=7800

76x102=76x(100+2)=76x100+76x2=7600+152=775278x46+78x54=78x(46+54)=78x100=7800

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