搜搜考试网x(n)=[(1 2)的n次方 (1 3)的n次方]u(n),求该序列的z变换
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![x(n)=[(1 2)的n次方 (1 3)的n次方]u(n),求该序列的z变换](/uploads/image/f/889154-26-4.jpg?t=x%28n%29%3D%5B%281+2%29%E7%9A%84n%E6%AC%A1%E6%96%B9+%281+3%29%E7%9A%84n%E6%AC%A1%E6%96%B9%5Du%28n%29%2C%E6%B1%82%E8%AF%A5%E5%BA%8F%E5%88%97%E7%9A%84z%E5%8F%98%E6%8D%A2)
若n为正整数,且x的3n次方=7,则2[x的2n次方*4的n次方（-x）的2n次方]的立方/（-2x）的6n次方=2[x^2n*2^2n*x^2n]的立方/（2^6x^6n）=2[2^2n*x^4n]
x^3n=2x^6n+x^2n*x^10n=x^(2*3n)+x^(2n+10n)=(x^3n)^2+x^12n=(x^3n)^2+x^(4*3n)=(x^3n)^2+(x^3n)^4=2^2+2^4
解x^n=5y^n=3所以（xy)^n=15所以(xy)^2n=[(xy)^n]^2=15^2=225希望对你哟帮助学习进步O(∩_∩)O
x^(6n)+y^(4n)=[x^(3n)]^2+[y^(2n)]^2=5×5+4×4=25+16=41
x^3n=27(x^n)^3=3^3x^n=3x^4n=(x^n)^4=3^4=81
x的2n次方=3(x的n次方)²=3x的n次方=±√3y的3a次方=-8(y的a次方)³=-8(y的a次方)³=(-2)³y的a次方=-2√表示根号!很高兴为您
x^(3n+1)*x+3x^(n+1)*x^(2n+1)=x^(3n+2)+3x^(n+1+2n+1)=x^(3n+2)+3x^(3n+2)=4x^(3n+2)
x^3n*x+3x^(n+1)*x^(2n+1)=x^(3n+1)+3*x^(2n+2)=x^(3n+1)*(1+3x)再问：问题补充！！！再答：x^(3n+1)*x+3x^(n+1)*x^(2n+1
(XY)^2N=[(XY)^N]^2=[(X^N)(Y^N)]^2=(5x3)^2=15^2=225
1、(x的n次方+y的n次方)（x的n次方-y的n次方）-（x的n次方+y的n次方）²=(x^n+y^n)(x^n-y^n)-(x^n+y^n)^2=(x^n)^2-(y^n)^2-[x^(
已知x的n次方>0,x的2n+m次方=171,x的m次方=19,x的2n次方=x的（2n+m）次方÷x的m次方=171/19=9;∵x的n次方>0∴x的n次方=3;∴x的3n次方=3³=27
X的6n次方=（X的3n次方）²=25Y的4n次方=（Y的2n次方）²=9
n为偶数时：2*x^(n+2)n为奇数时：0
x的3n=27x的m+2n次方＝x的m次方×x的2n次方＝4×9＝36
∵x的3n次方-x的2n次方+1=0∴x的3n次方=x的2n次方-1∴x的5n次方+x的n次方+2013=x的3n次方*x的2n次方+x的n次方+2013=（x的2n次方-1）*x的2n次方+x的n次
3x^(2n-1)-12x^(2n+1)=3x^(2n-1)(1-4x^2)=3x^(2n-1)(1+2x)(1-2x)
我敢肯定,你写错了一个字母!x^n=19应该是x^m=19,否则题目没有意义!x^(m+n)=57,x^m=19,求x^(3n)x^(m+n)=x^m×x^n=57；则x^n=x^m×x^n/x^m=
x^3n=2那么x^6n+x^2n*x^10n=(x^3n)²+x^12n=4+(x^3n)^4=4+2^4=4+16=20
=3(x的n次方+2)(x的n次方-2)/x³(x的n次方+3)²×(x的n次方+3)/(x的n次方-2)×1/x(x的n次方+3)=3(x的n次方+2)/x³(x的n次