x的4次方乘以y乘以括号里的x的负2次方乘以y的负3除以括号里的y 1的2次方-搜答案-灵鹊做题网

你好!13x²-6xy+y²-4x+1=0(9x²-6xy+y²)+(4x²-4x+1)=0(3x-y)²+(2x-1)²=0∴3

√(x^6+x^4y^2)=√x^4(x^2+y^2)=x^2√(x^2+y^2)

(-1/2*X^2*Y^3)*2^4*X^5*Y^5=(-1/2*2^4)*X^(2+5)*Y^(3+5)=-8X^7Y^8

(-1/2乘x^2乘y^3)乘2^4乘x^5乘y^5=-8乘x^7乘y^8

y=cos3x×e^(-2x)先知道：（cos3x）′=3×(-sin3x)=-3sin3x[e^(-2x)]′=-2e^(-2x)由(uv)′=u′v+uv′得：y′=(-3sin3x)×e^(-2

(x^y×y^y)/(x^x×y^y)=x^(y-x)×y^(x-y)因为x＞y＞0原式=x^-(x-y)×y^(x-y)=[y^(x-y)]/[x^(x-y)]=(y/x)^(x-y)

x^20*y^15*z^5=64=>(x^4*y^3*z^1)^5=64=>s=x^8*y^6*z^2=64^(2/5)=2^(7*2/5)=2^(14/5)

第n个:-1的n次方乘以n乘以x的n次方2010个:2010乘以x的2010次方

y=xe^xdy=[x'e^x+x(e^x)']dx=(e^x+xe^x)dx

^表示次方x^(m-n)*x^(2n+1)=x^11x^(m-n+2n+1)=x^11∴m+n+1=11m+n=10①y^(m-1)*y^(4-n)=y^7y^(m-1+4-n)=y^7m-n+3=7

∫cos^3xdx=∫cosxcos^2xdx=∫cosx(1-sin^2)dx=∫cosxdx-∫cosxsin^2xdx=-sinx-1/2∫sin2xsinxdx=-sinx-1/2∫(-1/2

已知x的20次方乘以y的15次方乘以z的5次方等于32,那么：(x的4次方*y的3次方*z)的5次方=2的5次方即有：x的4次方*y的3次方*z=2所以：x的8次方乘以y的6次方乘以z的2次方=(x的

如果本题有什么不明白可以追问,

原式=(x-y)^3*(y-x)^4/(y-x)^3/(x-y)=(x-y)^7/(x-y)^3/(x-y)=(x-y)^4/(x-y)=(x-y)^3

-(x-y)^2(-x-y)^4=-(x-y)^2(x+y)^2(x+y)^2=-(x^2-y^2)^2(x+y)^2=-[(x^2-y^2)(x+y)]^2=-[x^3-xy^2+yx^2-y^3]

四倍的五次根号下四楼下那个X的8次方乘以Y的6次方乘以Z的2次方不就是X的4次方乘以Y的3次方乘以Z的1次方的平方么不用那么麻烦吧

2^x*3^y*37^z=1998=2*3^3*37x=1,y=3,z=1（X-Y+Z)^2008=(-1)^2008=1

xy³+xy²+xy=xy(y²+y+1)

(x-y)^2(x-y)^3*(y-x)^2*(y-x)^3=-(x-y)^2(x-y)^3*(x-y)^2*(x-y)^3=-(x-y)^10

y'=[(2x+1)²(3x+4)³]'=[(2x+1)²]'(3x+4)³+(2x+1)²[(3x+4)³]'=2(2x+1)(2x+1)