已知4M+N=9,2M-3N=1,求(M+2N)²-(3M-N)²的值
已知4m+n=9,2m-3n=1,求(m+2n)²-(3m-n)²的值
已知4M+N=9,2M-3N=1,求(M+2N)²-(3M-N)²的值
已知-m²+2m=4n,-n²+2n=4m,求m/n的值
已知M=1/3,N=1/27,求(M-N/根号M-根号N)+(M+4N-4根号MN/根号M-2N)的值.
已知m-2n=3.求[(3m+2n)(3m-2n)-(m+2n)(5m-2n)]÷1/3 m 的值.
已知m+n+=3,mn=三分之二,求m²+(n-m)²+2m(n-mn)的值
已知|2m-n/m+2n|=3,求2(2m-n)/m+2n-2m-n/m+2n-3的值
已知m-3n=2m+n-15=1,求m²+n²的值
已知-m+2n=-6求3(m-2n)²-5(m-2n)-1的值
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
已知m/n=5/3 求(1/m+n+1/m-n)÷1/n-n/m-n÷m+n/n的值,
已知:m/n=5/3,求(1/m+n+1/m-n)÷1/n-n/m-n÷m+n/n的值