x乘以y乘以7等于
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x平方乘以y平方=(xy)^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
(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)
200乘以6加x等于7乘以(x—30)200*6+x=7[x-30]1200+x=7x-210x-7x=-210-1200-6x=-1410x=235
y=xe^xdy=[x'e^x+x(e^x)']dx=(e^x+xe^x)dx
X=7or-7Y=3or-3
(x-y)³×(x-y)²×(y-x)=(x-y)³×(x-y)²×[-(x-y)]=-(x-y)的6次方
3xx-2xy-8yy=0(3x+4y)(x-2y)=0所以(3x+4y)=0或(x-2y)=0所以x=-4y/3或x=2y所以x/y=-4/3或2
75再答:y可以被抵消最后你发现2x=150
由已知得,y=x(ax^4+bx^2+c)设ax^4+bx^2+c=d则无论x=-3或x=3,d的值是不变的d=7除以-3=-7/3那么当x=3时,y=3×(-7/3)=-7
原式=(3x²+7xy+2y²)(x-2y)=(3x+y)(x+2y)(x-2y)=(3x+y)[x²-(2y)²]=(3x+y)(x²-4y
y=19.8-15.84=3.96x=y除以19.8=0.2
x的平方乘以y的平方乘以(x+y)的平方=x²y²(x²+2xy+y²)=x^4y²+2x³y³+x²y^4很高兴为您解
yyy=y*111=y*3*37所以两位数肯定是37所以xc=3,y=7
15x
2^x*3^y*37^z=1998=2*3^3*37x=1,y=3,z=1(X-Y+Z)^2008=(-1)^2008=1
x平方-y平方=4(x+y)(x-y)=4(x+y)平方*(x-y)平方=4*4=16
设高品位为x,低品位为yx+y=100100*65.4=66.5x+61.6y665x+616y=65400616x+616y=6160049x=3800=>x=77.551(克)=>y=22.449