神马作文网已知负3分之1X与3XY是同项式,则M次方=
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1/x-1/y=3得y-x=3xy∴xy=(y-x)/3则x-xy-y=x-y-(y-x)/3=4(y-x)/35x+xy-5y=5(x-y)+(y-x)/3=14(x-y)/3∴(5x+xy-5y)
xy分之x加y等于2∴x+y=2xy3x减5xy加3y分之负x加3xy减y=[-(x+y)+3xy]/[3(x+y)-5xy]=(-2xy+3xy)/(6xy-5xy)=xy/(xy)=1
由 1/X-1/Y=5,两边同乘 XY,得出Y-X=5XY,那么 分子 -X+XY+Y=6XY分母 2X+7XY-2Y=7XY-2(Y-X)=-3XY 得此分式的值为－2
已知x分之1-y分之1=3,则有y-x=3xy(5x+xy-5y)/(x-xy-y)=7/2
x+3y=0；x=-3y；x/y=-3;负x-2y分之负x加2y=(-x+2y)/(-x-2y)=(-x/y+2)/(-x/y-2)=(3+2)/(3-2)=5;很高兴为您解答,skyhunter00
9x^2/2y再问：貌似是负的吧再答：没看见前面的“负”…………
/>1/x-1/y=3(y-x)/(xy)=3y-x=3xyx-y=-3xy(2x-14xy-2y)/(x-2xy-y)=[2(x-y)-14xy]/[(x-y)-2xy]=[2×(-3xy)-14x
x=0,y=-1xy＋y分之x＋3x＋2x＝0+0+0+0=0
1/x-1/y=3(y-x)/(xy)=3y-x=3xy(x-2xy-y)/(2x+3xy-2y)=[-(y-x)-2xy]/[-2(y-x)+3xy]=(-3xy-2xy)/(-6xy+3xy)=5
已知A=2X的2次方+3XY+2X-1,B=负X的平方+XY=3x,且a-2B的值与X无关,求Y的值A-2B=XY+8X-1值与X无关,得Y=-8
丨x+2丨+丨y-3丨等于0所以x＋2=0,y-3=0x=-2,y=3所以负2又2分之1-3分之5y+4xy=负2又2分之1-3分之5×3+4×（-2）×3=-2.5-5-24=-31.5
x-y分之xy=-3分之1xy分之(x-y)=-3x-y=-3xyx-2xy-y分之2x+3xy-2y=(-6xy+3xy)/(-3xy-2xy)=3/5
解x/y=3∴x=3y∴(x²+xy)/y²=(9y²+3y²)/y²=12y²/y²=12最简公分母(x-1)²(x+
已知xy/(x+y)=2,求:(3x-5xy+3y)/(-x+3xy-y)xy/(x+y)=2得：xy=2(x+y)(3x-5xy+3y)/(-x+3xy-y)=(3x-9xy+3y+4xy)/(-x
﹣xy²z³系数次数系数为：-1次数为：字母的指数和：1+2+3=6
=xy(1-2y^2)=-0.119616
x+x^-1=4两边平方x²+2+x-=6x²+x-²=14所以原式=2*14=28x+y=2xy=-3则x²+y²=(x+y)²-2xy=
a-1=1,-b=1a=2,b=-12分之1的ab2次方+6分之5a的2次方b减3分之1ab的2次方减a的2次方b=2分之1的ab2次方-3分之1ab的2次方+6分之5a的2次方b-a的2次方b=1/
x-2xy-y分之2x-3xy-2y=(2x-3xy-2y)/(x-2xy-y)分子分母同时除以xy=(2/y-3-2/x)/(1/y-2-1/x)=[-3-2(1/x-1/y)]/[-2-(1/x-
1/x-1/y=3(y-x)/(xy)=3y-x=3xyx-y=-3xy(2x+3xy-2y)/(x-2xy-y)=[2(x-y)+3xy]/[(x-y)-2xy]=(-6xy+3xy)/(-3xy-