观察下列各式:x,-2x∧2,3x∧3,-4x∧4,...,19x∧19,-20x∧20,...,则第n个单项式是( )
(∧表示次方,如:∧2=2次方)
人气:111 ℃ 时间:2019-08-18 11:52:36
解答
(-1)^(n-1)*n*x^n
即-1的n-1方乘以n乘以x的n次方
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