足球循環(huán)賽中,甲隊(duì)勝乙隊(duì)4:1,乙隊(duì)勝丙隊(duì)1:0,丙隊(duì)勝甲隊(duì)1:0,若每個(gè)隊(duì)的進(jìn)球總數(shù)記為正數(shù),失球總數(shù)記為負(fù)數(shù),請你計(jì)算各隊(duì)的凈勝球數(shù).

解:甲隊(duì)凈勝球數(shù)為:(+4)+(-2)=2;
乙隊(duì)凈勝球數(shù)為:(+2)+(-4)=-2;
丙隊(duì)凈勝球數(shù)為:(+1)+(-1)=0.
答:甲隊(duì)凈勝球數(shù)為2,乙隊(duì)凈勝球數(shù)為-2,丙隊(duì)凈勝球數(shù)為0.
分析:根據(jù)凈勝球數(shù)=進(jìn)球總數(shù)+失球總數(shù),直接代數(shù)求值即可.
點(diǎn)評:此題主要考查正負(fù)數(shù)在實(shí)際生活中的應(yīng)用,所以學(xué)生在學(xué)這一部分時(shí)一定要聯(lián)系實(shí)際,不能死學(xué).
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19、足球循環(huán)賽中,甲隊(duì)勝乙隊(duì)4:1,乙隊(duì)勝丙隊(duì)1:0,丙隊(duì)勝甲隊(duì)1:0,若每個(gè)隊(duì)的進(jìn)球總數(shù)記為正數(shù),失球總數(shù)記為負(fù)數(shù),請你計(jì)算各隊(duì)的凈勝球數(shù).

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