3X 4Y=10 [1]4X-3Y=5[2]
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![3X 4Y=10 [1]4X-3Y=5[2]](/uploads/image/f/297612-36-2.jpg?t=3X+4Y%3D10+%5B1%5D4X-3Y%3D5%5B2%5D)
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y=(4x^2+4xy+y^2+y^2-4x^2-8xy+2y^2)/4y=(-4xy+4y^2)/4y=-x+y=-1/2+1/3
多项式3x2-34x4y-1.3+2xy2有4项组成,最高项是-34x4y,次数是5,常数项是-1.3.∴(1)四项式;(2)3x2,-34x4y,-1.3,2xy2;(3)-34x4y;(4)5次;
原式=(9x²+24xy+16y²-4x²+y²-5x²+6xy-y²)÷(-2y)=(30xy+16y²)÷(-2y)=-15x
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=4x-2y-z-5x[6y-(x+y)]+x-(3y-10z)=4x-2y-z-30xy+5x²+5xy+x-3
我怕来不及,等等发给你!再问:慢慢来,,,,,,再问:还没好??
3(x+y)+3(y-x)=1(1)3(x+y)+4(y-x)=-1(2)(2)-(1)得y-x=-2(3)代入(1)3(x+y)-6=1x+y=7/3=>x=7/3-y又由(3)得x=y+2y+2=
-2x-{4x-2y-[3x-(2x+1)]-10}=-2x-{4x-2y-3x+2x+1-10}=-2x-4x+2y+3x-2x-1+10=-5x+2y+9=-5*(-3)+2*2009+9=401
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)=4x^2-y^2+2xy-8x^2-y^2+4xy+2y^2-6xy=-4x^2=-4(-1/4)^2=-1/4
多项式2x3y2-3x2y3-5x4y+6xy4-5中,x的系数依次3,2,4,1,按x的降幂排列是-5x4y+2x3y2-3x2y3+6xy4-5.
很多数学符号,还是写出来方便.
条件不完全.补充后给你解答.4x-5y是4x=5y还是缺少了等号后的值?再问:4x-5y=3再答:
(x+y)/2-(3x-y)/4=12(x+y)/4-(3x-y)/4=1(2x+2y-3x+y)/4=1-x+3y=4x=3y-4y=-3.5时,x=-10.5-4=-14.5y=3/7时=9/7-
3(x+y)-4(x-y)=4(x+y)/2+(x-y)/6=1令a=x+y,b=x-y3a-4b=4(1)a/2+b/6=1则3a+b=6(2)(2)-(1)5b=2b=2/5a=(6-b)/3=2
(0.2x+0.1y)/2-(4x-y)/10=(x-y)/5+(3x+0.5y)/30①(3x+2y-1)/8=3-(0.8x-5y)/41②①两边同时乘以60得(6x+3y)-(24x-6y)=(
∵-2x3m+1y2n•4xn-6y-3-m=-8x3m+n-5y2n-3-m,又∵-2x3m+1y2n与4xn-6y-3-m的积与-4x4y是同类项,∴3m+n−5=42n−3−m=1,解得:m=2
为你提供精确解答先化简:(x^2-y^2-x^2+2xy-y^2+2xy-6y^2)/(-4y)=(4xy-8y^2)/(-4y)=-x+2y=-1-4=-5其他的正在为你解答.
4x-3y-10=08x-6y=203x-2y=09x-6y=0x=-20,y=-303x-4(x-y)=23x-4x+y=2x-y=-23x-3y=-62x-3y=1x=-7,y=-52(x+y)-
解9y=3x-(x-1)2x-9y+1=0①4(x+y)-(2x+4)=8y2x-4y-4=0②②-①得:5y-5=0∴y=1将y=1代入①得:2x-9+1=0∴x=4∴方程的解为:x=4,y=1
完整设1/(x+y)=a,1/(x-y)=b原方程组可变为4a+6b=39b-a=1a=9b-136b-4+6b=3b=1/6,a=1/2x+y=2x-y=6所以原方程组的解为:x=4,y=-2
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