求5x-3y=16
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|x|=3x=3或-3|y|=5y=5或-5|x-y|=|x|+|y||x|=3|y|=5|x|+|y|=8|x-y|=8x-y=8或-8由此可得y=5x=-3或y=-5x=3x+y=2或-2x-y=
两个式子作差得到x=5带入得到y=23
x*x+√3y=√5,y*y+√3x=√5x*x+√3y=y*y+√3xx*x+√3y-y*y-√3x=0(x-y)(x+y)-√3(x-y)=0(x-y)(x+y-√3)=0x≠y,x-y≠0x+y
分子分母同时除以Y令x比y=Z即使求Z=?(2Z+3)/(5z-3)=3/515Z-9=10Z+15Z=24/5
y=x^5+ln^3xy'=(x^5)’+(ln^3x)‘=5x^4+3(lnx)²/X
5x-2y=x-y=4x-3y-2则4x=y代入:x-4x=4x-12x-2得到x=-2/5y=-8/5
x+y=3,x²+2xy+y²=9x²+y²=5,2xy=4x²-2xy+y²=1,(x-y)²=1(x-y)^2014=[(x-
由题意可得如下方程组:3x-y+5=02x-y+3=0解得:x=-2y=-5/2再问:很可惜思路对了得数错了Y=-1你是第一个回答我的还是选你吧
可以得出x.x+y.y-6x-8y+25=x.x-6x+9+y.y-8y+16=(x-3).(x-3)+(y-4).(y-4)=0因为(x-3).(x-3)>=0,(y-4).(y-4)>=0所以x=
x=3y所以原式=11y/7y=11/7
x/y+y/x=(x²+y²)/xy=[(x+y)²-2xy]/xy=(x+y)²/xy-2=25/3-2=19/3
x:y=7/5:7/3=3:5=21:35y:x=7:y:z=7:8=35:40x:y:z=21:35:40
因为(x-y)/(x+y)=3,则(x+y)/(x-y)=1/3则5(x-y)(x+y)-(x+y)/2(x-y)=5*3-1/(3*2)=15-1/6=89/6
解(2x-y)/3=2(x+3y)/5=2即2x-y=6①x+3y=10②①×3得:6x-3y=18③③+②得:7x=28∴x=4,y=2
若x-y/x+y=5则x-y=5(x+y)所以求x-y/2x+2y+5x+5y/3x-3y=5(x+y)/[2(x+y)]+5(x+y)/3(x-y)=5/2+5(x+y)/[3*5(x+y)]=5/
3x-2y5=x+y3交叉相乘,乘积相等:5(x+y)=3(3x-2y)5x+5y=9x-6y11y=4x4x=11y那么x:y=11:4
x=7/3.y=1/3
应该是3X=4Y,5Y=6Z吧?X+Y:Y+Z=[(4Y/3)+Y]:(Y+5Y/6)=14;11
原式=x-x+x-x+……-x+(2-1+4-3+5-4+……+2008-2007-2009)y=0+(1×1004-2009)y=-1005y=1005/2