【 】÷【mn】=2m-3n
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【 】÷【mn】=2m-3n
【 】÷【mn】=2m-3n
【 】÷【mn】=2m-3n
【 2m²n-3mn²】÷【mn】=2m-3n
【 】÷【mn】=2m-3n
急2[mn+(-3m)]-3(2n-mn),m+n=2 mn=-3
1/M+1/N=5 (3M+MN+2N) / (M-MN=3N)
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已 知m-n=4,mn=-1,求:(-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
已知m-n=3,mn=-3,求(-m-4n-mn)-(2mn-2m-3n)-(3mn+2n-2m)的值
已知m-n=3,mn=-1,求多项式-2mn+2m+3n-3mn-2n+2m-4n-m-mn的值
已知m-n=2,mn=1,求多项式(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知m-n=4,mn=2,求多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值.