有这样一道题计算(x² x)(x²-2x-1) (x²-1)
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因为(x^2+x)*(x^2-2x+1)/(x^2-1)*(x^2-x)化简=1所以x取任何值这个式子结果都是1
x2-2x+1/x2-1*x-1/x2+x-x=(x-1)2/(x-1)(x+1)/x-1/x2+x-x=x-1/x+1xx2+x/x-1-x=x(x+1)/x+1-x=x-x=0因为x=0,所以无论
原式=(x-y)(x²+2xy+y²-xy)-(x-y)(x²-2xy+y²+xy)=(x-y)(x²+xy+y²)-(x+y)(x&sup
(x-y)[(x+y)(x+y)-xy]+(x+y)[(x-y)(x-y)+xy]=(x-y)(x+y)^2-(x-y)xy+(x+y)(x-y)^2+(x+y)xy=(x-y)(x+y)(x+y+x
因为(2x+3)(3x+2)-6x(x+3)+5x+16=6x^2+13x+6-6x^2-18x+5x+16=6+16=22含x的项被消去,结果与x无关,所以无论代入x等于多少,结果都为22,不变.
题目化简,带入即可.(x²-2x+1)/(x²-1)÷[(x-1)/(x²+x)]-x=(x-1)²/(x-1)(x+1)×[x(x+1)/(x-1)]-x=(
原式=(x−1)2(x−1)(x+1)•x(x+1)x−1-x=x-x=0,当x=2007,原式=0;当x=2070,原式=0.因为原分式化简得结果为0,与x无关,只有x的取值满足分式有意义即可,所以
因式分解,得原式=x(x+1)(x-1)(x-1)/(x+1)(x-1)x(x-1)=1,不管x是几,结果都为1
[(x^2-2x+1)/(x^2-1)]/[(x-1)/(x^2+x)]-x=[(x-1)^2/[(x-1)(x+1)]]/[(x-1)/[x(x+1)]-x=[(x-1)/(x+1)]*[x(x+1
原式=(x−1)2(x+1)(x−1)×x(x+1)x−1-x=x-x=0.即原代数式的值与x的取值无关.故甲同学把x的值抄错结果仍正确.
(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)前面各项均可约掉=-2y^3所以把x看错不会影响计算,
(x^2-2x+1/x^2-1)÷(x-1/x^2+x)-x实在让人不明白究竟该怎么写纸上发一张图吧
看图再答:再答:原式化简后是常数,和X无关
(2x立方-3x平方y-2xy平方)-(X立方-2XY²)+(-X立方+3X²Y-Y立方)=2x³-3x²y-2xy²-x³+2xy
解代数式得:-3x的平方y-2y的三次方因为1/2的平方=-1/2的平方,所以结果仍正确给分吧!嘿嘿!
(x^2-2x+1/x^2-1)÷(x-1/x^2+x)-x=(x-1)^2/[(x-1)(x+1)]*[x(x+1)/(x-1)]-x=(x-1)/(x+1)*[x(x+1)/(x-1)]-x=x-
原式=x^2-2x+1/x^2-1÷x-1/x^2+x-x=x-x=0因为原式恒为0也即是x的取值与原式无关故他的计算结果正确也在情理之中很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满