SAT数学题,求翻译和讲解A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms of x, how many dollars will the carpeting cost? (1 yard=3 feet)A 20x B 28x C 60

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SAT数学题,求翻译和讲解A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms of x, how many dollars will the carpeting cost? (1 yard=3 feet)A 20x B 28x C 60
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SAT数学题,求翻译和讲解A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms of x, how many dollars will the carpeting cost? (1 yard=3 feet)A 20x B 28x C 60
SAT数学题,求翻译和讲解
A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms of x, how many dollars will the carpeting cost? (1 yard=3 feet)
A 20x B 28x C 60x D 180x E 540x
答案是A,求讲解

SAT数学题,求翻译和讲解A rectangular floor 18 feet by 10 feet is to be completely covered with carpeting that costs x dollars per square yard. In terms of x, how many dollars will the carpeting cost? (1 yard=3 feet)A 20x B 28x C 60
一个18英尺×10英尺的矩形场地铺满地毯,地毯的价格是每平方码x美元.请用包含x的式子表示地毯的总价格.（提示：1码 = 3英尺）

1码 = 3英尺,所以1平方码 = 9平方英尺
18×10 = 180平方英尺 = 20平方码
所以总价格为20x

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