5.(1)(x+3)(x+3)
=x^2+6x+9
(2(2m+4)(m-2)/2
=(m+2)(m-2)
=m^2-4
6.ï¼1ï¼è§£åå¼=ab-ac-bc+ab+ac-bc
=2ab-2bc
å½a=1,b=2,c=-1æ¶
2ab-2bc
=2*1*2-2*2*ï¼-1ï¼
=8
ï¼2ï¼è§£åå¼=x^2-3x+2-3x^2-9x+2(x^2+x-2)
=-3x+2-9x+2x-4
=-10x-2
å½x=1/3æ¶
-10x-2
=-10/3-2
=-16/3
7.解åå¼=500^2-ï¼500-1ï¼*ï¼500+1ï¼
=500^2-(500^2-1)
=1
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