fuxiangm
幼苗
共回答了20个问题采纳率:90% 举报
(-2x-1)^2*(m-1/2-1)-(m-1)^2+(1/2+1)^2
=(4x^2+4x+1)*(m-2/3)-(m^2-2m+1)+9/4
=(4x^2)m+4xm+m-(8/3)x^2-(8/3)x-(2/3)-m^2+2m-1+9/4
=(4x^2+4x+1-m+2)m-(8/3)x^2-(8/3)x-(2/3)+5/4
=(4x^2+4x+3-m)m-(2/3)(4x^2+4x+1)+5/4
=(4x^2+4x+3-m)m-(2x+1)^2+5/4
1年前
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