[計量] GWD10-20,21
Q20. If x > 0, then 1/[v(2x)+vx]=
A. 1/v(3x)
B. 1/[2v(2x)]
C. 1/(xv2)
D. (v2-1)/vx
E. (1+v2)/vx
Ans. D
我的答案是A 可是搞不懂為啥是D 怎麼算出來的？
Q21. When Leo imported a certain item, he made a 7 percent import tax on
the portion of the total value of the item in excess of $1000.
If the amount of the import tax that Leo paid was $87.50, what was
the total of the item?
A. $1600
B. $1850
C. $2250
D. $2400
E. $2750
Ans. C
看不太懂題目的意思勒 請教一下題意和作法為何？ THX.
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