①2x^2+xy-y^2-4x+5y-6 ②x^2+4xy-4y^2,我算出来=﹙x+2y+2√2·y﹚﹙x+2y-2√2·y﹚③x^2+2x-1=(x+1+√2)(x+1-√2)对不对?
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化简:5根号X^3Y-2Y根号XY-6根号XY+根号X分之Y+根号Y分之X
① 3y-xy/x2-3x其中x=-1,y=2 ②x²-4y²/x²-4xy+4y²其中x =5,y=-1
1.先化简再求值(½ x²y+1/5 xy²-¼xy)·(-½xy²),其中x=-2 y=-½[3xy(1-x)-6xy﹙x-½)]·2x·(-xy)²,其中x=﹣1 y=23xy²(-1/3x²y+4x²y²)-4x²y(﹣¾xy²
1.先化简再求值(½ x²y+1/5 xy²-¼xy)·(-½xy²),其中x=-2 y=-½[3xy(1-x)-6xy﹙x-½)]·2x·(-xy)²,其中x=﹣1 y=23xy²(-1/3x²y+4x²y²)-4x²y(﹣¾xy²
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2x²-5x+x²+4x-3x² -3x²y+2xy²+3xy²-2x²y 2x²-5x+x²+4x-3x² -3x²y+2xy²+3xy²-2x²y
先化简,在求值1.x²-(x²+2xy-y²)+5(y²-3xy),其中x=1/17,y=1/3﹙2﹚5xy-[x²+2xy-2y²﹚],其中x=﹣2,y=﹣15xy-[x²+4xy-y²-(x²+2xy-2y²﹚],其中x=﹣2,y=﹣1
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①2x^2+xy-y^2-4x+5y-6 ②x^2+4xy-4y^2,我算出来=﹙x+2y+2√2·y﹚﹙x+2y-2√2·y﹚③x^2+2x-1=(x+1+√2)(x+1-√2)对不对?