若√2-x-√x-2-y=6
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∵实数x,y满足x=√(9-x+2y)+√(3x-6y-27)+5∴9-x+2y≥0,3x-6y-27≥0∴9≥x-2y,x-2y≥9即9≦x-2y≦9∴x-2y=9∴x=√(9-x+2y)+√(3x
4x²+y²-4x-6y+10=0,4x²-4x+1+y²-6y+9=0(2x-1)²+(y-3)²=0x=1/2y=3[2x/3*√(9x
y=x^(3/2)-3x^(1/2)+3x^(-1/2)求导:(3/2)x^(1/2)-(3/2)x^(-1/2)-(3/2)x^(-3/2)
直接用商的求导法则y'=(u'v-uv')/v^2y'=[x^2((1/2)x^(-1/2)+5x^4+cosx)-2x√x-2x^6-2xsinx]/x^4然后化简就得到结果
因4x²+y²-4x-6y+10=0所以4x²-4x+1+y²-6y+9=0(2x-1)²+(y-3)²=0所以2x-1=0,y-3=0x=
即(4x²-4x+1)+(y²-6y+9)=0(2x-1)²+(y-3)²=0所以2x-1=y-3=0x=1/2,y=3原式=2x√x+√(xy)-x√x-5√
4x^2+y^2-4x-6y+10=0.配方得(2x-1)^2+(y-3)^2=0,∴2x-1=0,y-3=0,解得x=1/2,y=3.∴(2/3)√(9x)+y^2√(x/y^3)-[x√(1/x)
我确定没错,
(x²-4x+4)+(y²-2y+1)=0→(x-2)²+(y-1)²=0→x=2,y=1原式=(√2+1)/2
(6x√y/x+3/y*√xy^3)-(4x√x/y+√36xy)=6√(xy)+3√(xy)-4x/y*√(xy)-6√(xy)=(3-4x/y)√(xy)x=3/2,y=27时,原式=(3-2/9
因为8-X>=0X-8>=0所以X-8=8-X=0所以X=8所以Y=18接下去自己慢慢算
若(x-y)/(x+y)=3那么x-y=3(x+y)x-y=3x+3y故x=-2y所以(x+2y)/(6x-7y)=(-2y+2y)/(6*(-2y)-7y)=0如果不懂,请Hi我,祝学习愉快!
(x-3)^2+(y+1)^2=0推得x=3y=-1√3x+y/√x+√x+y=√9-1/√3+√2=-4+2√6
√x(√x+2√y)=√y(6√x+5√y)(√x)²-4√(xy)-5(√y)²=0(√x-5√y)(√x+√y)=0∴√x=5√y√x=-√y舍去原式=[(√x)²-
x(x*x-1)+x(5-x*x)-6y+7=-x+5x-6y+7=2(2x-3y)+7=2*(-4)+7=-8+7=-1再问:能在写详一点吗-x+5x-6y+7再答:x(x*x-1)+x(5-x*x
(2/3x√9x6x√y/x)(y√x/y-x²√1/x)=2/3*x*3√x6x*√(xy)/xy*√(xy)/y-x²√x/x=2x√x6√(xy)√(xy)-x√x=x√x7
按部就班套公式
根号里面的数要求:2-x≥0x-2≥0x≤2x≥2得:x=20+0-y=3y=-3y^x=(-3)^2=99算术平方根=3
由x-1≠0,-x²+x+2≥0得x≠1,(x-2)(x+1)≤0即:x≠1,-1≤x≤2取二者交集可得函数定义域为:x∈[-1,1)并(1,2]
依题意,x-2>=0,2-x>=0,所以x-2=0,x=2,y=-6所以结果为-6^(1/3)初一的题目大概是这样的吧:√(2-x)-√(x-2)-y=6