3^m=3,x^n=2,求x^(3m 2m)-搜答案-搜搜做题作业网

x^2m+3n=x^2m×x^3n=(x^m)^2×(x^n)^3=1/3^2×2^3=8/9再问：为什么先是（x^n）^3而不是(x^3)^n?再答：x^3是多少你知道？

因为x^m=3,x^n=6所以x^(m-n)=x^m/x^n=3/6=1/2x^(3m-2n)=x^3m/x^2n=(x^m)^3/(x^n)^2=(3^3)/(6^2)=3/4

∵x^m=3,x^n=6　∴x^(m-n)　　=(x^m)/(x^n)　　=3/6　　=1/2　∴x^(3m-2n)　　=[x^(3m)]/[x^(2n)]　　=[(x^m)³]/[(x^n

再问：可是指数相加的话两个数不是要相乘么再答：抱歉哈，打错了

x^3m+x^2n=(x^m)^3+(x^n)^2=2^3+5^2=8+25=33

x^2(x+m)-3x(x+2)-2n=x(x^2-6)+4,——》[x^2(x+m)-3x(x+2)-2n]-[x(x^2-6)+4]=0,——》(m-3)x^2-(2n+4)=0,——》m-3=0

2x(M＋3x)=6x²y²＋N2xM＋6x²=6x²y²＋N所以N=6x²,且2xM=6x²y²,即M=3xy&sup

x^(2m-3n)=(x^2m)/(x^3n)=(x^m)²/(x^n)³=a²/b³很高兴为您解答,祝你学习进步!【数学之美】团队为您答题.有不明白的可以追问

(x^m)^2=x^2m=3^2=9(x^n)^3=x^3n=(1/3)^3=1/27x^2m-3n=（x^m)^2÷(x^n)^3=9÷1/27=243

x^3m+2n=x^3m*x^2n=x^m*x^m*x^m*x^n*x^n=6^-1*6^-1*6^-1*3*3=24^-1

解析2*(M+3x)=2*m+6x=6x²y²+N两边比较2*m=6x²y²m=3x²y²N=6x再问：我没看明白。请问这几个算式都是为什么

3x(M-5x)=6x^2y^3+N,3x*M-15x^2=6x^2y^3+NM=2xy^3N=-15x^2

题不全啊

由于2x(M+3x)=6x^2y^2+N,所以2xM+6x^2=6x^2y^2+N比较可知2xM=6x^2y^2,6x^2=N所以M=3xy^2,N=6x^2

x^(3m+2n)=x^3m*x^2n=(x^m)^3*(x^n)^2=2^3*3^2=8*9=72

x^(3m+2n)=(x^m)^3*(x^n)^2=3^3*2^2=27x4=108x^(3m-2n)=(x^m)^3÷(x^n)^2=3^3÷2^2=27/4X的3m+2n次方

第二问：x^2m+x^3n=(x^m)²+(x^n)³=2²+3³=31不懂可以问,

x^3m-2n=x^(3m)÷x^(2n)=(x^m)^3÷（x^n)^2=2³÷3²=8/9再问：已知a的m次方乘a的n次方=a的七次方,a的m次方除a的n次方=a的五次方,求m

X^M=5那么x^(3M)=5^3=125X^N=3那么x^(2N)=3^2=9∴x^3M+2N=x^(3M)*x^(2N)=125*9=1125

（1）x^(m+n)=x^m×x^n=10x^(m-n)=x^m/x^n=2/5(2)x^(3m-2n)=x^3m/x^2n=8/25