當(dāng)n=1時(shí). 查看更多

 

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當(dāng)n=1時(shí),有(a-b)(a+b)=a2-b2;當(dāng)n=2時(shí),有(a-b)(a2+ab+b2)=a3-b3;當(dāng)n=3時(shí),有(a-b)(a3+a2b+ab2+b3)=a4-b4;當(dāng)n=4時(shí),有(a-b)(a4+a3b+a2b2+ab3+b4)=a5-b5;當(dāng)n∈N*時(shí),可歸納出的結(jié)論是
(a-b)(an+an-1b+…+abn-1+bn)=an+1-bn+1
(a-b)(an+an-1b+…+abn-1+bn)=an+1-bn+1

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當(dāng)n=1時(shí),有(a-b)(a+b)=a2-b2;當(dāng)n=2時(shí),有(a-b)(a2+ab+b2)=a3-b3;當(dāng)n=3時(shí),有(a-b)(a3+a2b+ab2+b3)=a4-b4;當(dāng)n=4時(shí),有(a-b)(a4+a3b+a2b2+ab3+b4)=a5-b5;當(dāng)n∈N*時(shí),可歸納出的結(jié)論是   

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當(dāng)n=1時(shí),有(a-b)(a+b)=a2-b2;當(dāng)n=2時(shí),有(a-b)(a2+ab+b2)=a3-b3;當(dāng)n=3時(shí),有(a-b)(a3+a2b+ab2+b3)=a4-b4;當(dāng)n=4時(shí),有(a-b)(a4+a3b+a2b2+ab3+b4)=a5-b5;當(dāng)n∈N*時(shí),可歸納出的結(jié)論是________.

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當(dāng)n∈{1,2,-1,
12
}
時(shí),冪函數(shù)y=xn的圖象不可能經(jīng)過第
 
象限.

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當(dāng)n∈{1,2,-1,
1
2
}
時(shí),冪函數(shù)y=xn的圖象不可能經(jīng)過第 ______象限.

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