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求助几道数学题，万分感谢！
1、If n is a multiple of 5 and n=(p^2)*q, where p and q are prime numbers, which of the following must be a multiple of 25?
A. P^2 B.q^2 C.p*q D.(p^2)*(q^2) E.(p^3)*q
答案是C，俺不懂啊
2、If x and y are integers greater than 1. Is x a mupltiple of y?
条件一：3y^2+7y=x
条件二：(x^2)-x is a multiple of y
答案是A，依旧不懂啊
3、A certain business produced x rakes each month from November through February and shipped x/2 rakes at the begining of each month from March through October. The business paid no storage costs for the rakes from Noveber through February, but it paid storge costs of $0.1 per rake each month from March through October for the rakes that had not been shipped. In terms of x, what was the total stortage cost, in dollars, that the business paid for the rakes for the 12 months from November through October?
A.0.4x
B.1.2x
C.1.4x
D.1.6x
E.3.2x
答案是C，不懂呃。。 |
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