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求xyy=1-x2的通解.
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设函数f(x)=ax3+bx2+cx+d,问常数a,b,c满足什么关系时,f(x)分别没 有极值、可能有一个极值、可能有两个极值?
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曲线y=x3-3x+2的拐点是__________。
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He developed computer software to handle complicated______(finance) transactions.
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His______(refuse) to come to our wedding upset the new couple.
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We will agree to sign the new contract provided that you increase our salaries by 5%.