2. 外语
  3. If, which of the following statements must be true?

If, which of the following statements must be true?

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问题 If, which of the following statements must be true?
选项 A、m = n
B、5m= 4n
C、5m= -4n
D、25m=16n
E、25m = -16n
答案E
解析 You can simplify each side of the equationas follows.

So the equationcan be rewritten as.
Cross multiplying in the rewritten equation gives 20(m + n)= 9(5m + 4n), which simplifies to 20m + 20n = 45m + 36n, or -16n = 25m. Thus the correct answer is Choice E.
This explanation uses the following strategy.
Strategy 5: Simplify an Arithmetic or Algebraic Representation
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