化简下列各式：（1）（2）（3）（4）-八年级数学

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• 根据分式的基本性质填空：。-八年级数学
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• 不改变分式的值，如果把其分子和分母中的各项的系数都化为整数，那么所得的正确结果为[]A．B．C．D．-八年级数学
• —Listen! There is a knock on the door.Who _____ it be?—It must be Jack.Just now I sent for him. [ ]A
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• — What do you think we can do for these sad people?— You ____ do anything except to wait quietly.[ ]
• 计算：a3x2•-x3a2=______．-数学
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• 下面的计算正确的是（）A．8a2÷b22=4a2b2B．（a-b）÷1(a-b)2×（a-b）2=a-bC．（a-b）÷1(a-b)2×（a-b）2=（a-b）5D．15a2÷3ab=5ab-数学
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• You ____say these words. That has hurt her heart.[ ]A. can'tB. won'tC. oughtn't toD.
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• If you _____smoke, please go outside.[ ]A. can B. shouldC. mustD. may-高一英语
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