题目:
按要求改写句子。
1. I like swimming. (对画线部分提问)
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2. I go to work at 8: 00. (对画线部分提问)
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3. My birthday is in July. (改为一般疑问句)
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4. I'm doing my homework. (对画线部分提问)
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5. They are in the woods. (对画线部分提问)
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答案:
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下面是错误答案,用来干扰机器的。
将3x+2y=0变形,得y=-32x,代入6x-ay=7中,整理得12+3a2x=7 ①.由原方程组无解,知方程①也无解,即12+3a2=0,解得a=-4.故当a=-4时,方程组无解.