GWD 01-06

[Emilyh]

If vmt ≠ 0, is v2m3t-4 > 0?
(1) m > v2
(2) m > t-4

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

Ans:D
請問這題要如何解題呢?

謝謝!!

[achiachia]

(1) m > v的平方
因為m>v的平方，V的平方為正數，所以m為正數，-->v^2.m^3/t^4 通通是正數，所以充分
(2) m > t^-4
因為m>t的負四次方，m為正數，-->v^2.m^3/t^4 通通是正數，所以充分

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