|m-5|+(n+3)²=0,求m²- n²+2m-5n的值
已知:m/n=5/3,求(m/m+n)+(m/m-n)-(n²/m²-n²)的值
|m-5|+(n+3)²=0,求m²- n²+2m-5n的值
若|m+n-5|+(2m+3n-5)²=0,求(m+n)²的值.
若|m+n-5|+(2m+3n-5)²=0 求(m+n)²的值
已知2n-m-5=0,求5(m-2n)²-3(m-2n)-60的值
若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
已知-m+2n=2,求5(m-2n)²+6n-3m-3的值
已知-m+2n=2,求(5m-2n)²+6n-3m-3的值
已知-m+2n=-6求3(m-2n)²-5(m-2n)-1的值
已知丨m-2丨+(n+5/1)²=0,求m-(m²n+3m-4n)+3(2nm²-3n)的
已知:3m-5n=0,求m/(m+n)+m/(m-n)-m^2/(m^2-n^2)的值