[(m+3n)(m-3n)+(2n-m^2)+5n^2(1-m)-(2m^2-m^2n)÷(-1⼀2mn),其中m=3,n=201

[(m+3n)(m-3n)+(2n-m^2)+5n^2(1-m)-(2m^2-m^2n)÷(-1/2mn),其中m=3,n=201
2025-02-23 15:52:41
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回答1:

1/3)n 2;-2mn