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1.分式a/xy与b/yz的最简公分母是()A.abxyzB.abxy²zC.xy²zD.xyz1.若1/2-|x|-2的值为整数,则整数x的值有个计算:1.a²-b²/a²b-ab²÷(1+(a²+b²)/2ab)先化简,再求值:1.x-y/(x
题目详情
1.分式a/xy与b/yz的最简公分母是( ) A.abxyz B.abxy²z C.xy²z D.xyz
1.若1/2-|x|-2的值为整数,则整数x的值有____个
计算:1.a²-b²/a²b-ab²÷(1+(a²+b²)/2ab)
先化简,再求值:1.x-y/(x²-2xy+y²)-xy+y²/x²-y²,其中(x-2)²+|y-3|=0
1.若1/2-|x|-2的值为整数,则整数x的值有____个
计算:1.a²-b²/a²b-ab²÷(1+(a²+b²)/2ab)
先化简,再求值:1.x-y/(x²-2xy+y²)-xy+y²/x²-y²,其中(x-2)²+|y-3|=0
▼优质解答
答案和解析
1、D
2、4
3、原式=(a+b)(a-b)/ab(a-b)×2ab/(a+b)²
=2/(a+b)
4、∵(x-2)²+|y-3|=0
∴x-2=0
y-3=0
∴x=2
y=3
原式=(x-y)/(x-y)²-y(x+y)/(x+y)(x-y)
=1/(x-y)-y/(x-y)
=(1-y)/(x-y)
=(1-3)/(2-3)
=2
2、4
3、原式=(a+b)(a-b)/ab(a-b)×2ab/(a+b)²
=2/(a+b)
4、∵(x-2)²+|y-3|=0
∴x-2=0
y-3=0
∴x=2
y=3
原式=(x-y)/(x-y)²-y(x+y)/(x+y)(x-y)
=1/(x-y)-y/(x-y)
=(1-y)/(x-y)
=(1-3)/(2-3)
=2
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