{2m+3n=3 ①4m-n=27② {3y=2x ①3x-2y=-5② 现在要 急
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{2m+3n=3 ①4m-n=27② {3y=2x ①3x-2y=-5② 现在要 急
{2m+3n=3 ①4m-n=27② {3y=2x ①3x-2y=-5② 现在要 急
{2m+3n=3 ①4m-n=27② {3y=2x ①3x-2y=-5② 现在要 急
2m+3n=3 ①
4m-n=27②
①x2得
4m+6n=6 ③
③-②得
7n=-21
n=-3
m=6
3y=2x ①
3x-2y=-5②
①x2得
4x-6y=0 ③
②x3得
9x-6y=-15 ④
④-③得
5x=-15
x=-3
y=-2
已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2=
(m-2n)(2n+m)-(-3m-4n)(4n-3m)=
.4(m+n)^2*(m+n)^3-7(m+n)(m+n)^4+5(m+n)^5=
(m-n)^3(n-m)^2(m-n)=_____
(3m-n)(m-2n)=()
m-[n-3m-(m-n)]=?
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-2根号n
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
(m-2n)^2+(3m-n)(2m+2n)-(2m+n)(2m-n) 已知m+n=4 mn=1
如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=
如果m,n互为相反数,求m+2m+3m+4m+5m+5n+4n+3n+2n+n=多少
m/n=5/3,求(m/m+n)+(m/m+n)-(n^2/m^2-n^2)
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
解二元一次方程组!(m+n)/3 - (m-n)/4=0.35 ① (m+n)/3 + (m-n)/2=0.5 ②
|m-n|=n-m,且|m|=4,|n|=3,则m+n=?
2m+3n+2m+3n+m+2m+3n+n=______
(m+4)^2+|n+3|=01/2m-n
1若m=n,则|m|=|n|;2若m=—n,则|m|=|n|;3若|m|=|n|,则m=—n;4若|m|=|n|,则m=n哪个对