2x的n次方乘以y的2n次方的3次方-搜答案-智慧作业帮

x的n次方等于4,y的n次方等于3x乘以y的2n次方=（x的n次方)²×﹙y的n次方﹚²=4²×3²=144

^表示次方x^(m-n)*x^(2n+1)=x^11x^(m-n+2n+1)=x^11∴m+n+1=11m+n=10①y^(m-1)*y^(4-n)=y^7y^(m-1+4-n)=y^7m-n+3=7

x^n=2y^n=3(x^2*y)^2n=x^4n*y^2n=(x^n)^4*(y^n)^2=2^4*3^2=16*9=144

原式=（x+y-z)^3n(x+y-z)^2n(x-y-z)^5n=(x+y-z)^5n(x-y-z)^5n=[（x-z)^2-y^2]^5n^后面的是上标~

[x^(2n)-y^(2n)]/[x^(n)+y^(n)]=(x^n-y^n)*(x^n+y^n)/(x^n+y^n)=x^n-y^n

0.25*x^b*y^c-0.125*x^(m+3)*y^(2n-2)要想合并同类项,则：b=m+3=2nc=2n-2=n(x,y的指数要相同）解得n=2m=1b=4c=2又0.25-0.125=0.

两边的次方数恒等（5m+n）*3=6由x的次方数得来（2m-n）*3=15由y的次方数得来二元一次方程解出来就能得出来了

原式=-x^(3+2n-1)-x^(2n+2)=-x^(2n+2)-x^(2n+2)=-2x^(2n+2)

(x+y的2n-1次方)乘以(-x-y的6次方)+(x+y的n+3次方)乘以(x+y的n+2次方)=(x+y)^(2n-1)×(x+y)^6+(x+y)^(n+3)×(x+y)^(n+2)=(x+y)

x^(6n)+x^(4n)*x^(5n)=x^(6n)+x^(9n)=[x^(3n)]^2+[x^(3n)]^3=2^2+2^3=4+8=12

=(x-y)的2n次方/x的2n次方×(-x的2n+1次方)/(x-y)的2n+1次方=-x/(x-y)=x/(y-x)

X^2*X^2n*Y^2n=X^2*(XY)^2n=(-5)^2(-5*1/5)^2n=25*1^2n=25手打不容易,再问：是整的还是负的再答：是正的！

(2x)^m*y^(3m)=2^m*x^m*y^(3m);(3xy)^(3n)=3^3n*x^3n*y^3n;两个式子为同类项,即两个式子x和y的次方数相同,所以有：m=3n;3m=3n推出m=n=0

x^2n=2y^4n=3(xy)^8n=x^8n*y^8n=(x^2n)^4*(y^4n)^2=2^4*3^2=16*9=1444^x*32^y=(2^2)^x*(2^5)^y=2^2x*2^5y=2

根据题意得：3m+1=6-n(1)2n=3-m(2)解得：m=7/5.n=4/5

[-2*x^(3m+n)*y^2n]*[7^(n-8)*y^(-3-m)]=-2*7^(n-8)*x^(3m+n)*y^(2n-3-m)由同类项得3m+n=6,2n-3-m=1解方程组得m=8/7,n

=y^3/X*1/2y=y^2/2x

3x^(m+1)*y^(m+n)-9x^2m*y^(2n-3)=ax^2m*y^(m+n)所以3-9=a,m+1=2=2m,m+n=2n-3所以a=-6,m=1,n=4如果不懂,祝学习愉快!

=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