(3+m)(3-m)+m(m-4)-7 其中m等于四分之一
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(3+m)(3-m)+m(m-4)-7其中m等于四分之一(3+m)(3-m)+m(m-4)-7其中m等于四分之一(3+m)(3-m)+m(m-4)-7其中m等于四分之一(3+m)(3-m)+m(m-4
(3+m)(3-m)+m(m-4)-7 其中m等于四分之一
(3+m)(3-m)+m(m-4)-7 其中m等于四分之一
(3+m)(3-m)+m(m-4)-7 其中m等于四分之一
(3+m)(3-m)+m(m-4)-7
=9-m²+m²-4m-7
=-4m+2
=-4*(1/4)+2
=-1+2
=1
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(3+m)(3-m)+m(m-4)-7 其中m等于四分之一
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