(-2m^2)^2*(-4m^3n)
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(-2m^2)^2*(-4m^3n)
(-2m^2)^2*(-4m^3n)
(-2m^2)^2*(-4m^3n)
0 ,且绝对值和平方值都大于等于0,
可得:2m-5 = 0 ,2m-5n+20 = 0 ,
解得:m = 5/2 ,n = 5 .
(-2m)^2-2m(5n-2m)+3n(6m-5n)-3n(4m-5n)
= 4m^2-10mn+4m^2+18mn-15n^2-12mn+15n^2
= 8m^2-4mn
= 4m(2m-n)
= 0
[(m-n)^2*(m-n)^3]^2/(m-n)^4
[(m-n)^2*(m-n)^3]^2/(m-n)^4
4m(m-n)^2+4n(n-m)^3
(m-n)2(n-m)3(n-m)4化简
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)=
(3m-4n)(4n+3m)-(2m-n)(2m+n)
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