x=2的m方加1,y=3加4的m放
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x^2y^2-4xy+x^2+y^2+1=(xy)^2-2xy+1+x^2-2xy+y^2=(xy-1)+(x-y)^2=0xy-1=0,x-y=0,x^2=y^2=1,x=y=1或x=y=-1x+y
(1)m²+3m+1=1m²+m≠0即m(m+3)=0m=0或m=-3而m(m+1)≠0m≠0,m≠-1所以m=-3(2)m²+3m+1=-1(m+1)(m+2)=0m=
(x²+y²+1)(x²+y²+3)=8(x²+y²)²+3(x²+y²)+(x²+y²)
已知x+y=1,则x^3+y^3+3xy=(x+y)(x^2-xy+y^2)+3xy=1×(x^2-xy+y^2)+3xy=x^2-xy+y^2+3xy=x^2+2xy+y^2=(x+y)^2=1^2
令2x平方加3x三次方加1为t,则y=cos三次方t令cost为a,则y=a的三次方.所以导数为3cos平方(2x平方加3x三次方加1)*{-sin(2x平方加3x三次方加1)}*(4x+9x的平方)
∵2mx²-x²+3x+1-(5x²-4x²+3x)的值与x无关∴(2m-1-5+4)x²+3x-3x+1=(2m-2)x²+1的值与x无关
X²+4X+Y²-6Y+13=0X²+4X+4+Y²-6Y+9=0(X+2)²+(Y-3)²=0X=-2,Y=3
x^2+y^2-4x-10y+29=0x^2-4x+4+y^2-10y+25=0(x-2)^2+(y-5)^2=0x=2y=5x^y+xy^2=xy(x+y)=2*5(2+5)=70
14=1+4+9所以(x²-2x+1)+(y²+4y+4)+(z²+6z+9)=0(x-1)²+(y+2)²+(z+3)²=0平方大于等于0
已知A=x³+2y³-xy²,B=-y³+x³+2xy²,其中x等于1\3,y等于2A-B=(x³+2y³-xy
x²+2xy+4y²+x²y²+1=8xy(x²-4xy+4y²)+(x²y²-2xy+1)=0(x-2y)²
思路:把所求里逐渐凑成m^2+m+3,然后去掉即可m^5+3m^4+2m^3+2m^2-10m=m^5+m^4+3m^3+2m^4-m^3+2m^2-10m=m^3(m^2+m+3)+2m^4-m^3
y=1/4x^4+1/3x^3-1/2x^2-x+1y'=x^3+x^2-x-1=x^2(x+1)-(x+1)=(x+1)(x^2-1)=(x+1)^2(x-1),得极值点x=-1,1因为x=-1两端
已知:(x-1)(y-2)-x(y-3)=8,那么:xy-2x-y+2-xy+3x=8化简得:x-y=6所以:2分之(x²+y²)-xy=2分之(x²+y²-2
(x+y)²=x²+2xy+y²=12xy=-2xy=-1x³+y³=(x+y)(x²-xy+y²)=1*(3+1)=4再问:19
2x²+9y²+8xy-2y+1=0,即2(x+2y)²+(y-1)²=0,即y=1,x=-2y=-2则(x-y)^-3=(-2-1)^-3=-1/27
y=kx(最高次是一次,没有常数项)k≠02n+1=1n=0-m+n=0-m=0m=0不懂问我
由x+y=3平方得x^2+2xy+y^2=9又因为xy=1所以x^2+2×1+y^2=9所以x^2+y^2=7
x+y-3=0;2x-y+6=0;3x+3=0;x=-1;y=4;所以√(x²+y²)=√17;很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,
(3-x)²+|2x-y|=0因为一个数的平方大于等于0一个数的绝对值也大于等于0所以3-x=0且2x-y=0所以x=3,y=6所以x+y=9