计算:(a^n b^4)³·a^5 b^2n-9 -(a^n+1 b)³·(ab^n)²
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计算:(a^n b^4)³·a^5 b^2n-9 -(a^n+1 b)³·(ab^n)²
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(a^n b^4)³·a^5 b^2n-9 -(a^n+1 b)³·(ab^n)²
=a^3n b^12·a^5 b^2n-9 -a^(3n+3) b³·a²b^2n
=a^(3n+5) b^(2n+3) -a^(3n+5) b^(2n+3)
=0
=a^3n b^12·a^5 b^2n-9 -a^(3n+3) b³·a²b^2n
=a^(3n+5) b^(2n+3) -a^(3n+5) b^(2n+3)
=0
计算:(a^n b^4)³·a^5 b^2n-9 -(a^n+1 b)³·(ab^n)²
计算a-ab/a+b(a/a-b+b/b-a)和1-m-n/m+2n÷m²-n²/m²+4
计算:(-2ab²)³;[(-a²b的n次方)³·(a的n-1次方·b²
a^(n+1)b^n-4a^(n+2)+3ab^n-12a^2
1.S=a^n+a^(n-1)b+a^(n-2)b^2+……+ab^(n-1)+b^n(n∈N*,ab≠0)
计算:(1/a-b-1/a+b)÷2b/a²-2ab+b²;m/m-n-n/m+n+2mn/m
已知Un=a^n+a^(n-1)b+a^(n-2)b^2+...+ab^(n-1)+b^n(n∈N*,a>0,b>0),
(a-b)(a^(n-1)-b^(n-1))=(a-b)^2(a^(n-2)+a^(n-3)b+……+ab^(n-3)+
(a的n次方*b³)³ *a²*b的2n-7次方-(a的n+1次方*b)平方*(ab
a^(n+2)-(a^2)(b^n)/a(2n+1)-ab^2n
计算:(a-b)的n次方·[(b-a)的n次方]².
证明数列 an+a(n-1)b+a(n-2)b^2+...+ab^(n-1)+b^n=【a^(n+