数学题(先分解因式,再计算求值) 要过程,谢谢~
8个回答
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a+b/2)²-(a-b/2)²,
=(a+b/2+a-b/2)(a+b/2-a+b/2)
=2axb
=2ab
=2x(-1/8)x2
=-1/2
x²-16/8-2x
=(x+4)(x-4)/2(4-x)
=-(x+4)/2
=-(-2+4)/2
=-1
1/2x²+xy+1/2y²
=1/2(x+y)²
=1/2x1²
=1/2
=(a+b/2+a-b/2)(a+b/2-a+b/2)
=2axb
=2ab
=2x(-1/8)x2
=-1/2
x²-16/8-2x
=(x+4)(x-4)/2(4-x)
=-(x+4)/2
=-(-2+4)/2
=-1
1/2x²+xy+1/2y²
=1/2(x+y)²
=1/2x1²
=1/2
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原式=((a+b/2)+(a-b/2))((a+b/2)-(a-b/2))
= ab
= -(1/8)×2
= -(1/4)
= ab
= -(1/8)×2
= -(1/4)
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