1.原式=(X+1)^2+(Y-3)^2=0,解得X=-1,Y=3
2.依题意,得
3X^3+aX^2+bx+1
---------------=3x+1
x^2+1
整理得:3X^3+3x+x^2+1=3X^3+aX^2+bx+1
解得a=1,b=3
-a^b=-1
3.设长为X,宽为Y
依题意,得
X:Y=3:2
(X+3)*(Y+2)=XY+30
解得X=6,Y=4
1.原式=(X+1)^2+(Y-3)^2=0,解得X=-1,Y=3
2.依题意,得
3X^3+aX^2+bx+1
---------------=3x+1
x^2+1
整理得:3X^3+3x+x^2+1=3X^3+aX^2+bx+1
解得a=1,b=3
-a^b=-1
3.设长为X,宽为Y
依题意,得
X:Y=3:2
(X+3)*(Y+2)=XY+30
解得X=6,Y=4