23、甲車隊(duì)有50輛汽車,乙車隊(duì)有41輛汽車,如果要使乙車隊(duì)數(shù)比甲車隊(duì)車數(shù)的2倍還多1輛,應(yīng)從甲車隊(duì)調(diào)多少輛車到乙車隊(duì)?
分析:若設(shè)從甲車隊(duì)調(diào)x輛車到乙車隊(duì),注意兩個(gè)車隊(duì)的同時(shí)變化.
解答:解:設(shè)應(yīng)從甲車隊(duì)調(diào)x輛車到乙車隊(duì),
根據(jù)題意,得方程41+x=2(50-x)+1
解之得:x=20.
答:應(yīng)從甲車隊(duì)調(diào)20輛車到乙車隊(duì).
點(diǎn)評(píng):此題中的等量關(guān)系:乙車隊(duì)數(shù)比甲車隊(duì)車數(shù)的2倍還多1輛.
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