已知10^m=4,10^n=9,则10^(3m-n)/2=
已知m²+n²=10,m*n=4,则代数式-m^3n-n^3m=
分解因式:9-x²;已知4m+n=90,2m-3n=10,求(m+2n)²-(3m-n)²
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
已知m^2+9n^2+6m+6n+10=0,求(m^2-6mn+9n^2)/(m-3n)-(4m^2-9n^2)/(2m
已知m^2+9n^+6m+6n+10=0,求(m^2-6mn+9n^2)÷(m-3n)-(4m^2-9n^2)÷(2m-
已知10^m=20,10^n=0.2,求m-n,9^m除以3^2n的值
已知3^2m=5 3^n=10 求(1)9^m-n (2)9^2m-n
已知A=根号m+n+10的m-n次方是m+n +10的算术平方根,B=根号4m+6n-1的m-2n+3次方是4m+6n-
已知m^2+n^2-6m+10n+34=0,求m-n
已知4m+n=90,2m-3n=10,求(m+2n)2-(3m-n)2的值.
已知4m+n=90,2m-3n=10,求(m+2n)^2-(3m-n)^2的值
已知:4m+n=5,3n-2m=10,求(m+2n)²-(3m-n)平方