如题所述
第1个回答 2020-02-19
123X18-123X8+ 85X123
=123x(18-8+85)
=123x95
=123x(100-5)
=123x100-123x5
=12300-615
=11685本回答被网友采纳
=123x(18-8+85)
=123x95
=123x(100-5)
=123x100-123x5
=12300-615
=11685本回答被网友采纳
第2个回答 2023-03-10
123*18-123*8
=123*(18-8)
=123*10
=1230
85*123
=(80+5)*123
=80*123+5*123
=80*(125-2)+5*(125-2)
=80*125-80*2+5*125-5*2
=10000-160+625-10
=10000+625-(160+10)
=10000+625-170
=10000+455
=10455
=123*(18-8)
=123*10
=1230
85*123
=(80+5)*123
=80*123+5*123
=80*(125-2)+5*(125-2)
=80*125-80*2+5*125-5*2
=10000-160+625-10
=10000+625-(160+10)
=10000+625-170
=10000+455
=10455