若x的3n次方=5,则x的6n=多少
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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
=9*5³-4*5²=1025再问:一步一步
x^(6n)+y^(4n)=[x^(3n)]^2+[y^(2n)]^2=5×5+4×4=25+16=41
3x的6n次方+2x的4n次方乘x的5n次方=3x^6n+2x^9n(1)把x的3n次方=2代入(1)=3(x^3n)^2+2(x^3n)^3=3*2^2+2*2^3=3*4+2*8=12+16=28
X^2n=2(x^2n)3=x^6n=8y^3n=3(y^3n)^2=y^6n=9(xy)^6n=x^6n*y^6n=8*9=72
(X的3n次方)²-5(x²)2n次方=x^6n-5x^4n=(x^n)^6-5(x^n)^4=5的6次方-5×5的4次方=5×5的5次方-5的5次方=4×5的5次方=12500
(XY)^2N=[(XY)^N]^2=[(X^N)(Y^N)]^2=(5x3)^2=15^2=225
(xy)的n次方=x的n次方×y的n次方=15(x²y³)的n次方=(x^2×y^2×y)的n次方=(xy)的2n次方×y的n次方=15的平方*5=1125(0.25)的2003次
X的6n次方=(X的3n次方)²=25Y的4n次方=(Y的2n次方)²=9
x^m=2x^n=5x^(m+n)=x^m*x^n=2*5=10x^(m-n)=x^m/x^n=2/5x^(3m-2n)=x^(3m)/x^(2n)=(x^m)^3/(x^n)^2=2^3/5^2=8
(x的3n次方)平方-4(x平方)的2n次方=(x的2n次方)³-4(x的2n次方)²=7³-4×7²=147
n=4再问:x呢再答:你把后面的问题描述清楚或写成数学式,我可能帮得到你现在我看不懂你的意思,谢谢
x^(6n)+x^(4n)*x^(5n)=x^(6n)+x^(9n)=[x^(3n)]^2+[x^(3n)]^3=2^2+2^3=4+8=12
x的(6n-4)次方×x的(2n+4)次方÷x的次方=x的(2n-5)次方∴6n-4+2n+4-n=2n-55n=-5n=-1
(2x^3n)^2=4x^(6n)=4(x^2n)^3=4*5^3=4*125=500
∵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
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