98*47-99*46的简便算法
问题描述:
98*47-99*46的简便算法
答
解: 98*47-99*46=(100-2)*47-(100-1)*46
=4700-94-4600+46
=(4700-4600)-(94-46)
=100-48
=52
答
=(99-1)*47-99*(47-1)=99*47-47-99*47+99=52
答
=(99-1)*(46+1)-99*46
=99*46+99-46-1-99*46
=99-46-1
=52
答
=(100-2)*47-(100-1)*46
=100*47-2*47-100*46+1*46
=100*47-100*46+1*46-2*47
=100*(47-46)+46-94
=100-94+46=6+46=52
答
98*47-99*46
=(99-1)*47-99*46
=99*47-47-99*46
=99*(47-46)-47
=99-47
=52
答
98*47-99*46
=100*47-2*47-100*46+1*46
=100*(47-46)-2*47+46
=100-2*46-2*1+46
=100-46-2
=52