已知5x减3y减2等于0,求10的10x次方除以10的6y次方
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已知x方加y方减2x加4y等于-5x方+y方-2x+4y+5=0x方-2x+1+y方+4y+4=0(x-1)方+(y+2)方=0所以x-1=0,y+2=0所以x=1,y=-2如果不懂,请追问,祝学习愉
已知|x-3|+|x+y-5|=0那么x-3=0,x+y-5=0所以x=3,y=2所以x-y=1如果不懂,祝学习愉快!再问:4-π的绝对值+3-π的绝对值有过程再答:|4-π|+|3-π|=4-π+π
∵(x+1)²+|y-2|=0 ∴x+1=0 y-2=0 ∴x=-1 y=2 ∴x²y²+3xy-7x²y²-(5/2)xy+1+5x²
4x减6的绝对值加2x减5y减1的绝对值等于04x-6=02x-5y-1=0解方程组得:x=3/2y=2/52x-3y=3-3*2/5=9/5
x^2+y^2+2x-4y+5=0,(x+1)^2+(y-2)^2=0,x=-1,y=2(-1)^2006-1/2=1-1/2=1/2
线性规划就行了,你学了吗?
X+Y≥2⑴2X-Y≤1⑵X-Y≥0⑶⑴+⑶X≥1⑶×-1Y-X≤0⑷⑵+⑷X≤1所以X=1代入⑶Y≤1所以2X+3Y≤5
x+y-2=0x+y=2x²-y²=(x+y)(x-y)=6x-y=6/(x+y)=6/2=3x-y-5=3-5=-2
再答:x=1/11y=-3/11
x^2+3y^2-12y+12=0x^2+3(y-2)^2=0所以x^2=0,3(y-2)^2=0x=0,y-2=0y=2y^x=2^0=1
1)设y1=k1(x+1),y2=k2(x-2)y=y1+y2=k1(x+1)+k2(x-2)=(k1+k2)x+k1-2k2x=2,y=9,则9=2(k1+k2)+k1-2k2得k1=3x=3,y=
再问:2/5再答:?
x²+y²-4x-2y+5=0x²-4x+4+y²-2y+1=0(x-2)²+(y-1)²=0x-2=0x=2y-1=0y=1√(x+y)/
3x-6y-5=03(x-2y)=5x-2y=5/32x-4y+6=2(x-2y)+6=2×5/3+6=28/3或9又1/3
已知x的绝对值等于3,y绝对值等于5,且dmx+y的绝对值等于-(x+y),求代数.A=(2x+y)的次方减3(x+y)的值X=+-3,Y=+-5,而x+y的绝对值等于-(x+y),所以x=+-3,而
x²-4x-1=0x²-4x=1所以:(2x-3)²-(x+y)(x-y)-y²=4x²-12x+9-(x²-y²)-y²
x=-2,y=5代入得-32a-8b-2c-1=5即32a+8b+2c=-6当x=2时y=ax的5次方加bx的3次方加cx减1=32a+8b+2c-1=-6-1=-7
1/x-1/y=3y-x=3xyx-y=-3xy(5x-xy-5y)/(x-xy-y)=(-15xy-xy)/(-3xy-xy)=4
(1/3)^(-x)=2.即:3^x=2.所以:(3^x)^4=((3^2)^x)^2=9^2x=2^4=16.1/3^(-y)=5.即:3^y=5.所以:(3^y)^2=(3^2)^y=9^y=25