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一道数学英文题,此外the area of the base of the cube是什麼意思?

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一道数学英文题,此外the area of the base of the cube是什麼意思?
1）the cost ,in dollars,of manufacturing x refrigerators is 9000+400x.the amount received when selling these x refrigerators is 500x dollars.what is the least number of refrigerators that must be manufactured and sold so that the amount received is at least equal to the manufacturing cost?
A10
B18
C45
D90
E100
2)the area of the base of the cube是什麼意思?
生产x 台冰箱的的成本需要9000+400x美元,卖掉这x 台冰箱的销售额是500x美元.问：至少需要生产并卖掉多少台冰箱才能使销售额和生产成本相等.
（方法你肯定知道了吧,解方程9000+400x=500x,解出x=90,选D）
the area of the base of the cube意思是：立方体的底面积.
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