1.若(x^m÷x^2n^3÷x^2m-n与2x^3是同类项,且m+5n=2,求m^2-25n的值.
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1.若(x^m÷x^2n^3÷x^2m-n与2x^3是同类项,且m+5n=2,求m^2-25n的值.1.若(x^m÷x^2n^3÷x^2m-n与2x^3是同类项,且m+5n=2,求m^2-25n的值.
1.若(x^m÷x^2n^3÷x^2m-n与2x^3是同类项,且m+5n=2,求m^2-25n的值.
1.若(x^m÷x^2n^3÷x^2m-n与2x^3是同类项,且m+5n=2,求m^2-25n的值.
1.若(x^m÷x^2n^3÷x^2m-n与2x^3是同类项,且m+5n=2,求m^2-25n的值.
因为两个式子是同类项,所以两式x的次数相同.
所以m-2n×3-2m=3,和m+5n=2联立,解得m=27,n=-5
所以m^2-25n=854
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