作业帮[(m+3n)(m-3n)+(2n-m)^2+5n^2(1-m)-(2m^2-m^2n)]÷(-1/2mn),其中m=7/2,n=200
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[(m+3n)(m-3n)+(2n-m)^2+5n^2(1-m)-(2m^2-m^2n)]÷(-1/2mn),其中m=7/2,n=200
[(m+3n)(m-3n)+(2n-m)^2+5n^2(1-m)-(2m^2-m^2n)]÷(-1/2mn),其中m=7/2,n=200
[(m+3n)(m-3n)+(2n-m)^2+5n^2(1-m)-(2m^2-m^2n)]÷(-1/2mn),其中m=7/2,n=200
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