解: 7.5*46.7+39.9*2.5
=7.5*46.7+(46.7-6.8)*2.5
=46.7*(7.5+2.5)-6.8*(5/2)
=467-17
=450
7.5*46.7+39.9*2.5
=7.5*46.7+7.5*(39.9/3)
=7.5*(46.7+13.3)
=7.5*60
= 450
7.5×46.7+39.9×2.5
=2.5×3×46.7+2.5×39.9
=2.5×(140.1+39.9)
=2.5×180
=450
解:原式=2.5×3×46.7+39.9×2.5
=2.5×140.1+39.9×2.5
=2.5×(140.1+39.9)
=2.5×180
=450
>> 7.5*46.7+39.9*2.5
ans =
450
结果是450
希望我的回答会对你有帮助!
7.5×46.7+39.9×2.5=2.5×[(50-3.3)×3+39.9]=2.5×(150-9.9+39.9)=2.5×180=2.5×4×45=450