初一数学..狠急..话说挺难得

a得平方+b得平方-4a+6b+13=0,
(a-2)^2+(b+3)^2=0,
a=2,b=-3,
所以a^b(a得b次方)=2^(-3)=1/8

x^3-3x^2+3x-9
=x^2(x-3)+3(x-3)
=(x-3)(x^2+3)
能被x+a整除，则a=-3.

a^2+a+1=0,
a^2+a=-1
a^4+a^3-3a^2-4a+3
=a^2(a^2+a)-3a^2-4a+3=-4a^2-4a+3=7.

有知数2^50-4^7能被60到70之间得两个数整除，这两个数是 A.61.63 B.63.65 C.65.67 D.67.69
2^50-4^7=2^50-2^14
=2^14(2^36-1)
=2^14(2^18+1)(2^18-1)
=2^14(2^6+1)(2^12-2^6+1)(2^6-1)(2^12+2^6+1)
2^6+1=65,2^6-1=63.
选(B).

2x^2+2xy+y^2-2x+1=0,
(x+y)^2+(x-1)^2=0,
则x+y=0.

1.a^2+b^2-4a+6b+13=0 配方得
(a-2)^2+(b+3)^2=0
所以 a=2 b=-3
a^b=9

2.x^3-3x^2+3x-9 因式分解得
(x-1)^3-8
=(x-1-2)((x-1)^2+2(x-1)+4)
=(x-3)((x-1)^2+2x+2)
=(x-3)(x^2+3)
所以a=-3

3.a^4+a^3-3a^2-4a+3
=a^2(a^2+a-3)-4a+3
=a^2(a^2+a+1-4)-4a+3
=-4a^2-4+3
=-4(a^2+a+1-1)+3
=4+3
=7

4.2^50-4^7
=2^14(2^36-1)