已知函数y=x分之2和y=3x+n
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2x-y分之x+y=2,则2x-y=2(x+y)4x-2y分之x+y-4x+4y分之2x-y=2(2x-y)分之x+y-4(x+y)分之2x-y=4(x+y)分之x+y-4(x+y)分之2(x+y)=
y=x-2分之根号3x+2x≠2且x≥-2/3y=1-根号x分之1x>0
解原式=2(x-y)/(x+y)-(x+y)/3(x-y)=6(x-y)(x-y)/[3(x+y)(x-y)]-(x+y)x+y)/[3(x-y)(x+y)]=5(x-y)(x-y)/[(x+y)(x
答:x>1,x-1>0所以:y=2x+1/(x-1)y=2(x-1)+1/(x-1)+2y>=2√[2(x-1)*1/(x-1)]+2y>=2√2+2当且仅当2(x-1)=1/(x-1)即x-1=√2
因为x+y分之2x-y=2又因为x+y分之4x-2y是它的2倍所以x+y分之4x-2y就=4因为x+y分之2x-y=2倒过来2x-y分之x+y就为1/2又2x-y分之4x+4y是2x-y分之x+y的4
(-2,-3)和(2,3)
x+y分之x-y=2求x+y分之3x-3y减x-y分之2(x+y)的值x+y分之x-y=2x-y=2(x+y)(x+y)分之(3x-3y)-(x-y)分之2(x+y)的值x+y分之3x-3y=(x+y
y/x=(-2x/3)/x=-2/3
应该是y=x分之(3-2m)y随x的增大而减小则系数大于0所以3-2m>0m
(1)k=xy=-4*3=-12(2)当x=6时,y=-12/6=-2(3)因为3*(-4)=-12=k,所以e点在反比例函数图象上因为2*(-5)=-10不等于-12,所以f点不在反比例函数图像上很
因为:3分之x+1=4分之y+3=5分之x+y,所以:(x+1)/3=(y+3)/4=(x+y)/54x+4=3y+94x=3y+55x+5=3x+3y2x=3y-5x=5y=5则x+2y+3分之3x
5x=-3yx=-3|5y直接带进去得答案,或者=2\3x-2|3x+2|x+y的和乘(x+y)除以x-y|x=2乘x\x-y=2(-3\5y)\(-3\5y-y)=3\4手机果然不行.
首先证明函数的单调性定义证明:在x∈[2,3]任取两值x1,x2,且x1
3x+2y=0y=-1.5xx/y=x/-1.5x=-2/3y分之3x+3=3x/-1.5x+3=1
(x+y)/(x-y)=3/2[(x/y)+1]/[(x/y)-1]=3/23(x/y)-3=2(x/y)+2x/y=5y/x=1/5(x^2+y^2)/xy=x/y+y/x=5+1/5=26/5
y=x-2+x-4分之1=x-4+1/(x-4)+2>=2+2=4最小值为4利用a+1/a>=2
原式等价于10(x+1)=5(y+3)=4(x+y)10(x+1)=5(y+3)可得2x-y=15(y+3)=4(x+y)可得4x-y=15解得x=7y=13x+2y+3=363x+2y+1=48两式
y=sin(1/2x+π/3),x属于R当1/2x+π/3=2kπ+π/2时,y=sin(1/2x+π/3)有最大值1此时x=4kπ+π-2π/3=4kπ+π/3,k∈Z当1/2x+π/3∈【2kπ+
3X-2=X/(1+X)(3X-2)(1+X)=X3X^2+X-2=X3X^2-2=0X^2=2/3X=三分之根六或X=负的三分之根六