化简求值:-(y x)-(5x-2x)
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原式=y2-2y+1,当y=-1时,原式=y2-2y+1=(-1)2-2×(-1)+1=4.
[2x+5][2x-5]-3x[4/3x-1]=4x²-25-4x²+3x=3x-25,其中x=-2013原式=3x-25=-6039-25=-6064
原式=—3x(5x-3x+12-6)=—3x(2x+6)=(-3)8×(2×8+6)=-24×22=-528
∵x−yx+y=2,∴x-y=2(x+y),∴x−yx+y-2x+2yx−y=2(x+y)x+y-2(x+y)2(x+y)=2-1=1,故答案为:1.
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原式=5a²-[a²+5a²-2a-2a²+3a]=5a²-4a²-a=a²-a
以x为主元,将方程整理为3x2-(3y+7)x+(3y2-7y)=0,∵x是整数,∴△=[-(3y+7)]2-4×3(3y2-7y)≥0,∴21−1439≤y≤21+1439,∴整数y=0,1,2,3
-x^2y+5xy^2-yx^2=-2x^2y+5xy^2
2(x^2y+2y^2-xy^2)-(2yx^2-3xy^2+3x^2)=2x²y+4y²-2xy²-2x²y+3xy²-3x²=4y
2(x^2y+2y^2-xy^2)-(2yx^2-2xy^2+3x^3)=2x^2y+4y^2-2xy^2-2x^y+2xy^2-3x^3=4y^2-3x^3=4*2^2-3*(-3)^3=16+81
原式=[3x/(x-1)-2x/(x+1)]*(x+1)(x-1)/x=3x/(x-1)*(x+1)(x-1)/x-2x/(x+1)*(x+1)(x-1)/x=3(x+1)-2(x-1)=3x+3-2
3-2xy+3yx²+6xy-4x²y=3+4xy-x²y=3+1x2+(-1)²x2=3+2+2=7
原式=2XY+3YX^2+6XY-6X^2Y吧=8XY-3X^2Y=XY(8-3X)代入已知数:原式=-2*(8-3/2)=-13
|x+3|+(y-1/2)^2=0|x+3|=0,(y-1/2)^2=0x=-3y=1/26x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y=6x^2y-6x^2y+2xy-
(-5x^3-x^2)-(-7x^2+2x^3)=-5x^3-x^2+7x^2-2x^3=-7x³+6x²再问:-3(2a^2-2ab)+4(a^2+ab-6)再答:-3(2a^2
(x²-6x+9)/(2x-6)=(x-3)²/[2(x-3)]=(x-3)/2=(5-3)/2=2/2=1很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按
[23x-2x+y(x+y3x-x-y)]÷x−yx=(23x-23x+2)×xx−y=2xx−y,∵5x+3y=0,∴y=-53x,∴原式=2xx+53x=34.
解题思路:解:x^2-3x+1=0x-3+(1/x)=0x+(1/x)=3所以x+=(x+1/x)-2=3-2=9-2=7因为网站有规定,每次只解一题,希望你在提问广场再提问一次好吗?解题过程
原式=5x-(2x²+5x-1)=5x-2x²-5x+1=-2x²+1=-2×9+1=-17再问:�������ʲô����������һ��������ʽxy��2�η
化简:[(y²-x²)/(5x²-4yx)]/[(x+y)/(5x-4y)]原式=[(y+x)(y-x)/x(5x-4y)]×[(x+y)/(5x-4y)]=(y-x)/