www.whkt.net > 728x79十272x79简便计算

728x79十272x79简便计算

728x79十272x7=(728十272)x79=29000

可以写成(728*77)+(272*77)+272*2=(728+272)*77+272*2=1000*77+544=77000+544=77544再看看别人怎么说的.

728x79+272x29=(730-2)*(80-1)+(270+2)*(30-1)=730*80-2*80-730+2+270*30+2*30-270-2=58400-160-730+8100+60-270=65400

728x79+272x79=(728+272)x79=1000x79=79000

728*79+272*79=(728+272)*79=100*79=7900

998*79+79+79=79*(998+1+1)=79*1000=79000

12.5x79十12.5=12.5x(79+1)=12.5x80=125x8=1000朋友,请【采纳答案】,您的采纳是我答题的动力,谢谢.

728+【272+986】 =(728+272)+986 =1000+986 =1986

1457-728+43-272=(1457+43)-(728+272)=1500-1000=500

728+346+272+54二(728十272)十(346十54)二1000十400二1400

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