2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?上面的2是平房的意思,我比较笨,三克油
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2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?上面的2是平房的意思,我比较笨,三克油
2 2
1.(2x+3y) -(x+2y)
2 2 2 2
2.3|x-3|+x -6xy+9y =0 则x y+2xy=?
上面的2是平房的意思,我比较笨,三克油
2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?上面的2是平房的意思,我比较笨,三克油
1、
平方差
原式=[(2x+3y)+(x+2y)][(2x+3y)-(x+2y)]
=(2x+3y+x+2y)(2x+3y-x-2y)
=(3x+5y)(x+y)
2、
3|x-3|+(x-3y)²=0
绝对值和平方都大于等于0
相加等于0,若有一个大于0,则另一个小于0,不成立.
所以两个都等于0
所以x-3=0,x-3y=0
x=3,y=x/3=1
所以x²y²+2xy=9×1+2×3×1=15
第一个等于(3x+5y)*(x+y)
x(x-y)2-(y-x)3
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
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