观察一列单项式：a ,-2a²,4a³,-8a⁴,···············第七个单项式为____第n个为______
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观察一列单项式：a,-2a²,4a³,-8a⁴,···············第七个单项式为____第n个为______观察一列单项式：a,-2a²,4a&#
观察一列单项式：a ,-2a²,4a³,-8a⁴,···············第七个单项式为____第n个为______
观察一列单项式：a ,-2a²,4a³,-8a⁴,···············第七个单项式为____第n个为______
观察一列单项式：a ,-2a²,4a³,-8a⁴,···············第七个单项式为____第n个为______
团队 俊狼猎英
-2^7*a^7
(-2)^(n-1)*a^n