they often have difficulty in solving these crimes.
题目
they often have difficulty in solving these crimes.
_______ these crimes is often difficult _____（同义句）
答案
they often have difficulty in solving these crimes.__solving_____ these crimes is often difficult _for them____（同义句）他们在解决这些犯罪（案子）时总遇到困难我觉得后面应该是两个空格吧,不然真不晓得怎...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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