解析:(1)A城市需付车费=10+超过3千米的付费,即10+1.2(x-3);B城市需付车费=8+超过3千米的付费,即8+1.4(x-3).
(2)让A城市的总付费-B城市的总付费即可.
(1)A:10+1.2(x-3)=1.2x+6.4;
B:8+1.4(x-3)=1.4x+3.8;
(2)A与B的差价=(1.2x+6.4)-(1.4x+3.8)
=2.6-0.2x.
解析:(1)A城市需付车费=10+超过3千米的付费,即10+1.2(x-3);B城市需付车费=8+超过3千米的付费,即8+1.4(x-3).
(2)让A城市的总付费-B城市的总付费即可.
(1)A:10+1.2(x-3)=1.2x+6.4;
B:8+1.4(x-3)=1.4x+3.8;
(2)A与B的差价=(1.2x+6.4)-(1.4x+3.8)
=2.6-0.2x.