由y=x三次方,x=2,y=0
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x三次方(x-2y)+y三次方(2x-y)=x³(x-2y)-y³(x-2y)=(x-2y)(x³-y³)=(x-2y)(x-y)(x²+xy+y
(x+y+z)^3-x^3-y^3-z^3=(x+y+z)^3-x^3-(y^3+z^3)=(x+y+z-x)[(x+y+z)^2+x(x+y+z)+x^2]-(y+z)(y^2-yz+z^2)=(y
y'=6x^2-6x=0x=0,x=1x
1.18xy³÷(9y²/x)=2x²y2.2ab²c³÷[a^(-2)b]³=a^7*c³/4b4b分之(a的7次方c的三次方)
x³y³—2x²y²+xy=xy(x²y²-2xy+1)=xy[(xy)²-2xy+1]=xy(xy-1)²
原式=x^2(x+3y)-2(x+3y)+1=0+0+1=1
解y′=(x³·sinx)′=(x³)′sinx+(x³)(sinx)′=3x²sinx+x³cosx
y=f(x³)y`=3x²f`(x³)
设1995x³=1996y³=1997z³,x、y、z>0,且(1995x²+1996y²+1997z²)^1/3=1995^1/3+199
漫过柔软的心海,很轻,也很疼.关于遇见,我不知道用什么样的笔墨来描绘
原式=(x-y)^4(x-y)(x-y)^3=(x-y)^4(x-y)^4=2(x-y)^4
负(X-Y)的四次方
像这种题目也可以用特殊值去做,比如令x=1,代入方程求出y,再代入所求的式子就可以得出答案.
-8x四次方y+6x三次方y²-2x三次方y=-2x³y(4x-3y+1)
x^4-y^4=15x^3y-xy^3=6,化为;xy(x^2-y^2)=6两式相除得:(x^2+y^2)/(xy)=5/2得:2x^2+2y^2=5xy(2x-y)(x-2y)=0得x=y/2,或x
A=x³+2x²y+2y³-1,B=3+y³-2x²y+2x³∵A+B+C=0∴C=-A-B=-x³-2x²y-2y
∵x²+y²+6x-2y+10=0∴(x²+6x+9)+(y²-2y+1)=0即(x+3)²+(y-1)²=0由平方的非负性可得(x+3)&
再答:先提取y然后再分解因式
x^2-y^2=(x+y)(x-y)=21x-y=7x=5y=-2x^3+y^3=125-8=117
原式=(x-y)²[a²-2a(x-y)+(x-y)²]=(x-y)²[a-(x-y)]²=(x-y)²(2a-x+y)²