几道数学题目
1.已知X的平方+2X+Y的平方-6Y+10=0,求X平方*Y立方2. (4X+1)/(X-2)(X-5)=A/(X-2)+B/X-5
参考答案:1.x^2+2x+1+y^2-6y+9=0
(x+1)^2+(y-3)^2=0
x=-1,y=3
x^2*y^3=(-1)^2*3^3=27
2.右边=(ax-5a)+(bx-2b)/(x-2)(x-5)
=[(a+b)x+(-5a-2b)]/(x-2)(x-5)
所以(a+b)=4,-5a-2b=1
解之得:a=-3,b=7
1.已知X的平方+2X+Y的平方-6Y+10=0,求X平方*Y立方2. (4X+1)/(X-2)(X-5)=A/(X-2)+B/X-5
参考答案:1.x^2+2x+1+y^2-6y+9=0
(x+1)^2+(y-3)^2=0
x=-1,y=3
x^2*y^3=(-1)^2*3^3=27
2.右边=(ax-5a)+(bx-2b)/(x-2)(x-5)
=[(a+b)x+(-5a-2b)]/(x-2)(x-5)
所以(a+b)=4,-5a-2b=1
解之得:a=-3,b=7