分解因式: (1) 1-abcd+ac-bd (2) (x^2+c-3)(c^2+x-5)-3 已知:x,y满足x^2+y^2-4x+y+17/4=0,求(x+y)^2的值?
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(1) 1-abcd+ac-bd
=1+ac-abcd-bd
=(1+ac)-bd(1+ac)
=(1+ac)(1-bd)
(2) (x^2+x-3)(x^2+x-5)-3
=(x²+x)²-8(x²+x)+12
=(x²+x-2)(x²+x-6)
=(x+2)(x-1)(x+3)(x-2)
已知:x,y满足x^2+y^2-4x+y+17/4=0,求(x+y)^2的值?
(x-2)²+(y+1/2)²=0
x-2=0
y+1/2=0
∴x=2
y=-1/2
∴(x+y)²=(2-1/2)²=9/4
=1+ac-abcd-bd
=(1+ac)-bd(1+ac)
=(1+ac)(1-bd)
(2) (x^2+x-3)(x^2+x-5)-3
=(x²+x)²-8(x²+x)+12
=(x²+x-2)(x²+x-6)
=(x+2)(x-1)(x+3)(x-2)
已知:x,y满足x^2+y^2-4x+y+17/4=0,求(x+y)^2的值?
(x-2)²+(y+1/2)²=0
x-2=0
y+1/2=0
∴x=2
y=-1/2
∴(x+y)²=(2-1/2)²=9/4
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