七年級數學上冊答案18個-13/12-2/530-2/3+（-1/6）-（-1/4）-1/2=-8/12+(-2/12)-(-3/12)-6/12=(-8-2+3-6)/12=-13/123/5-3/2+（-11/4）+13/4=3/5-3/2+(-11+13)/4=3/5+(-3/2+1/2)=3/5-1=-2/531+（-5/4）+0.25=31+(-5/4)+1/4=31+(-5+1)/4=31-1=30{0}2，七年級上冊數學書129頁答案4:解:設另一村的人數為xx+(2x-3)=834x+...