have difficulty with sth中difficulty要不要遍复数?

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• have some difficulty (in) doing sth.中的 difficulty可数吗
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• have difficulty with sth中difficulty要不要遍复数?
• 在句式“have problem/difficulty/trouble + (in)doing sth./with sth.”中,中间的名词都用作了不可数名词,那么有没有在这里用作可数名词、用复数的情况呢?在其他地方这3个词,又是可数 还是不可数名词?
• have difficulty with sth中difficulty要不要遍复数?
• 在句式“have problem/difficulty/trouble + (in)doing sth./with sth.”中,中间的名词都用作了不可数名词,那么有没有在这里用作可数名词、用复数的情况呢?
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• 已知：x+y=1,xy=-1/2,利用因式分解求：x（x+y)(x-y)-x(x+y)^2
• .have some difficulty or difficulties?