如果x的四次方加y的四次方=15
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x^2-3x+1=0x-3+1/x=0x+1/x=3(x+1/x)^2=9x^2+2+1/x^2=9x^2+1/x^2=7(x^2+1/x^2)^2=49x^4+2+1/x^4=49x^4+1/x^4
16x的16次方-y的四次方z的四次方=(4x^8-y^2z^2)(4x^8+y^2z^2)=(2x^4-yz)(2x^4+yz)(4x^8+2y^2z^2)
先把X四次方-2Y四次方-3XY二次方+X二次方Y+2XY二次方+3Y四次方合并同类项,也就是X四次方+Y四次方-XY二次方+X二次方Y,提取负号变成(X四次方+Y四次方)-(XY二次方-X二次方Y)
请采纳,谢谢!
y'=4sin³xcosx-4cos³xsinx
y=sin^4x+cos^4x=(sin^2x)^2+(cos^2x)^2=(sin^2x)^2+2sin^2x*cos^2x+(cos^2x)^2-2sin^2x*cos^2x=(sin^2x+co
先分解因式,后乘法.(X^4-Y^4)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X+Y)(X^2+Y^2)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X^3+X^2Y+XY^2+
(2x^4)y³-x³y^4=(x³y³)(2x-y)=(xy)³(2x-y)=4³×(1/16)=4
1/(x^4)+4/(y^4)xy=1,所以y=1/x即y^4=1/(x^4)代入原式,得到1/(x^4)+4(x^4)再由重要不等式,得到1/(x^4)+4(x^4)≥2(根号)1/(x^4)·4(
x^4+4=(x^2)^2+2^2+4x^2-4x^2=(x^2+2)^2-4x^2=(x^2+2)^2-(2x)^2=(x^2+2x+2)(x^2+2-2x)
x^4+y^4=x^4+2x^2y^2+y^4-2x^2y^2=(x^2+y^2)^2-2x^2y^2=(x^2+y^2+√2*xy)(x^2+y^2-√2*xy)
6X的四次方减11
方法一:x^4+y^4+(x+y)^4=(x^4+2x^2y^2+y^4)-2x^2y^2+(x^2+2xy+y^2)^2=[(x^2+y^2)^2-(xy)^2]+[(x^2+y^2+2xy)^2-
原式=(x+y)(x-y)(x^2+y^2)(x^4+y^4)=(x^2-y^2)(x^2+y^2)(x^4+y^4)=(x^4-y^4)(x^4+y^4)=x^8-y^8
你确定是这样的式子?424x+3x+36y如果是这样的话应该是分不出来的
x的立方加y的立方等于459,x的四次方加y的四次方等于3621,再问:肯定要再答:其实不难x+y=9xy=10(x+y)平方=x方+y方+2xy则x方+y方=61后边x方写成xx,其他同理,切中英文
x^4+2x+1=x^4-x²+x²+2x+1=x²(x-1)(x+1)+(x+1)²=(x+1)(x³-x²+x+1)
y=(sinx)^4+(cosx)^4=(sin²x+cos²x)²-2sin²xcos²x=1-(1/2)(2sinxcosx)²=1-s
x^4+4=(x^2)^2+2^2+4x^2-4x^2=(x^2+2)^2-4x^2=(x^2+2)^2-(2x)^2=(x^2+2x+2)(x^2+2-2x)