(-2m^2)^2*(-4m^3n)
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(-2m^2)^2*(-4m^3n)
![(-2m^2)^2*(-4m^3n)](/uploads/image/z/15431396-68-6.jpg?t=%EF%BC%88-2m%5E2%29%5E2%2A%28-4m%5E3n%29)
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
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
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