数学填空题1,2,3题
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数学填空题1,2,3题
数学填空题1,2,3题
数学填空题1,2,3题
1 =(b-c)(b-c+3)=[(a-2)-(a-4)]*[(a-2)-(a-4)+3]=2*5=10
2设x2+y2=a 方程 a(a-1)-12=0 a2-a-12=0 (a+3)(a-4)=0 x2+y2=a=-3或x2+y2=4
3 =(x+y)2+7(x+y)-18=(x+y-2)(x+y-9)
1. 10
2. 4
3. (x+y-2)(x+y+9)