1.分解因式:a方-b方-4a+4b
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1.分解因式:a方-b方-4a+4b
(2x+y)方-6(2x+y)+9
x方-7x-18
2.分解因式后(x方+5x+3)(x方+5x-23)+k=(x方+5x-10)方,求k的值
3.若/a-2/+b方-2b+1=0,则a=( ),b=( )
(2x+y)方-6(2x+y)+9
x方-7x-18
2.分解因式后(x方+5x+3)(x方+5x-23)+k=(x方+5x-10)方,求k的值
3.若/a-2/+b方-2b+1=0,则a=( ),b=( )
1.a方-b方-4a+4b=a方-4a+4-(b方-4b+4)=(a-2)方-(b-2)方
(2x+y)方-6(2x+y)+9=(2x+y-3)方
x方-7x-18=(x-9)*(x+2)
2.(x方+5x+3)(x方+5x-23)+k=(x方+5x)方-20(x方+5x)-69+k
(x方+5x-10)方=(x方+5x)方-20(x方+5x)+100
所以k-69=100所以k=169
3.若/a-2/+b方-2b+1=0
/a-2/+b方-2b+1=/a-2/+(b-1)方=0
所以a-2=0 b-1=0
则a=(2),b=( 1)
(2x+y)方-6(2x+y)+9=(2x+y-3)方
x方-7x-18=(x-9)*(x+2)
2.(x方+5x+3)(x方+5x-23)+k=(x方+5x)方-20(x方+5x)-69+k
(x方+5x-10)方=(x方+5x)方-20(x方+5x)+100
所以k-69=100所以k=169
3.若/a-2/+b方-2b+1=0
/a-2/+b方-2b+1=/a-2/+(b-1)方=0
所以a-2=0 b-1=0
则a=(2),b=( 1)