若2x y=3求4x乘2y
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括号应该成对,还有一个括号在哪里?能不能把你的叙述用数学的语言表达出来?
xy/(2x+y)-xy/(2x-y)=3xy/(2x-y)+xy/(2x+y)=4;一、两公式对加得2xy/(2x+y)=7xy=(2x+y)*7/2二、把xy代入原公式求解就行了:(2x+y)*7
x^+2xy+y^+4=16(x+y)²=16-4=12(1)x^-2xy+y^=16(x-y)²=16(2)(1)-(2)2y*2x=-4xy=-1(3xy+6y^)+|x^-(
因为x-y=4xy所以x-2xy-y=2xy2x+3xy-2y=11xyx-2xy-y分之2x+3xy-2y=5.5
2x+y=0可得: y=-2x于是(x-2y)/(x²+xy)*(x²-y²)÷(x²-4xy+4y²)/x=(x-2y)/x(x+)*(x
(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)=-6xy+3x-3y=-6×(-2)+3×1=15
原式=3x-3y-6xy=3-12=-9
x=3y再答:带入再答:3.5
(4xy+12y)+[7x-(3xy+4y-x)]=4xy+12y+7x-3xy-4y+x=xy+8x+8y=xy+8(x+y)=(-2)+8*3=-2+24=22
(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)=-2xy+2x+3y-3xy-2y+2x-x-4y-xy=-6xy+3x-3y=-6xy+3*(x-y)当时,原式=-6*1+3*
因为x²+2y-根号2乘y=17+4根号2,所以x²+2y=17,-y=4解得y=-4,x²=25所以x=±5所以x-y=5-(-4)=9,或x-y=-5-(-4)=-5
2x的立方乘y+4x的平方乘y的平方+2xy的立方=2xy(x²+2xy+y²)=2xy(x+y)²=2×2×4²=64
1.若x分之1-y分之1=2,则求x-xy-y分之3x+xy-3y=0的值.若x分之1-y分之1=2变形(y-x)/xy=2,(y-x)=2xy(3x+xy-3y)/(x-xy-y)=[3(x-y)+
3/5再问:详细过程呢再答:y-x=3xyx-y=-3xy代入得:(-6xy+3xy)/(-3xy-2xy)=-3/-5=3/5
x²+y²-4x-6y=-13x²+y²-4x-6y+13=0x²-4x+y²-6y+13=0(x²-4x+4)+(y²
xy^2*(-x^2y^2)(1/2xy^3)^2=-xy^2*x^2y^2*1/4x^2y^6=-1/4x^5y^10(xy^2)^5=x^5y^10当xy^2=2时,原式=-1/4*2^5=-1/
得y-x=3xyx-y=-3xy原式=-15xy+2xy/-3xy-4xy=-13/-7=13/7
(Y-X)÷(XY)=3可变形为Y-X=3XY(2X+3XY-2Y)÷(X-2XY-Y)=(2X-2Y+3XY)÷(X-Y-2XY)={2(x-y)+3xy}÷(X-Y-2XY)={2(3xy)+3x
x+y=5xy(2x-3xy+2y)/(x+2xy+y)=[2(x+y)-3xy]/[(x+y)+2xy]=(2×5xy-3xy)/(5xy+2xy)=7xy/7xy=1再问:若x+1/x=3,求(x
(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)=-2xy+2x+3y-3xy-2y+2x-x-4y-xy=-6xy+3x-3y=-6*(-2)+3*1=15不懂可追问,有帮助请采