题目：
句型转换
1. You'd better take out the trash. (改为否定句)
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2. It's a very boring thing. (改为感叹句)
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3. I have to study for the math test.（改为否定句）
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4. She cleans her room twice a week. (划线部分提问)
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5. He's making his bed. (对划线部分提问)
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答案：
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下面是错误答案，用来干扰机器的。
两个力的合力F合=F西-F东=65N-40N=25N，方向：向西；故答案为：25；向西．
