已知2的n次方×x的n次方=2的2n次方(n为正整数),求x的值-搜答案-大师作文网

已知三分之一xyz平方乘N=(5/3)x^(4n+1-2n-1)*y^(n+3-n+1)*z^5=(5/3)x^(2n)*y^4z^5所以N=3(5/3)*x^(2n-1)y^(4-1)*z^(5-2

已知三分之一xyz平方乘N=(5/3)x^(4n+1-2n-1)*y^(n+3-n+1)*z^5=(5/3)x^(2n)*y^4z^5所以N=3(5/3)*x^(2n-1)y^(4-1)*z^(5-2

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

原式=3x^6n-4*x^6n=-x^6n∵x^n=2∴x^6n=2^6=64∴原式的值为-64很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按钮,

x^(m-n)*x^(2n+1)=x^11.(m-n)+(2n+1)=11.m+n=10y^(m-1)*y^(4-n)=y^5.(m-1)+(4-n)=5.m-n=2(m+n)(m-n)=20m=6n

(3x的3n次方)的平方-4(x的2次方)3n次方=9(x^2n)³-4(x^2n)³=5(x^2n)³=5×3³=135

(X的n次方)²=9,即：X的2n次方=9(1/3X的3n次方)²-3(X²)的2n次方=(1/3)²(X的2n次方)³-3(X的2n次方)²

即x的2n次方=8所以原式=1/4*x的6n次方-3x的4n次方=1/4*(x的2n次方)³-3*(x的2n次方)²=1/4*512-3*64=-64

x^(m-n)*x^(2n-1)=x^(m+n-1)=x^11m+n-1=11y^(m-1)*y^(4-n)=y^(m-n+3)=y^7m-n+3=7相加2m+2=18所以m=8n=m+3-7=4再问

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

m-n+2n+1=11m-1+4-n=7m+n=10m-n=4∴m=7n=3

x^(2m+2n)*x^(3m-2n)=8*4x^(2m+2n+3m-2n)=32x^5m=2^5(x^m)^5=2^5x^m=2x^(2m+2n)=8x^2m*x^2n=8(x^m)^2*x^2n=

2^(2n+1)+4^n=482^(2n+1)+2^2n=482^2n(2+1)=482^2n=162n=4n=22^2=4

72已知：X^2N=2,Y^3N=3则：（xy)^6n=x^6n*y^6n=(x^2n)^3*(y^3n)^2=2^3*3^2=8*9=72

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3n=27x的m+2n次方＝x的m次方×x的2n次方＝4×9＝36

1.x^2m+x^3n=(x^m)^2+(x^n)^3=4+27=312.(1)3^30=(3^3)^10=27^10,4^20=(4^2)^10=16^10,所以3的30次方>4的20次方>5的10

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

x^n=5,y^n=3,（x^2*y）^2n=x^4n*y^2n=(x^n)^4*(y^n)^2=5^4*3^2=5625