1.(x+y)(x-y)(x^2+y^2)=( )2.若x^2+mx+1/4 是一个完全平方式,则m的值为( )3.12x^7y^6z^5÷( )=4x^3y^3z^34.若(x+6)(x-7)=x^2+mx+n,则m=( ),n=( )5.已知x+1/x=3,则x^2+1/x^2=
1.(x+y)(x-y)(x^2+y^2)=( )
2.若x^2+mx+1/4 是一个完全平方式,则m的值为( )
3.12x^7y^6z^5÷( )=4x^3y^3z^3
4.若(x+6)(x-7)=x^2+mx+n,则m=( ),n=( )
5.已知x+1/x=3,则x^2+1/x^2=
没过程!
1.(x+y)(x-y)(x^2+y^2)=( x^4-y^4 )
2.若x^2+mx+1/4 是一个完全平方式,则m的值为( ±1 )
3.12x^7y^6z^5÷( 3x^4y^3z^2 )=4x^3y^3z^3
4.若(x+6)(x-7)=x^2+mx+n,则m=( -1 ),n=( -42 )
5.已知x+1/x=3,则x^2+1/x^2= ( 7 )
1.x^4+y^4
2.m=1
3.3x^4y^3z^2
4.m=-1 n=-42
5.9/2
1.X^4+Y^4
2.-1
3.
4.m=-1,n=-42
5.9-2=7
(x+y)(x-y)(x^2+y^2)=( x^4-y^4 )
若x^2+mx+1/4 是一个完全平方式,则m的值为(1 )
12x^7y^6z^5÷( 3x^4y^3z^2 )=4x^3y^3z^3
若(x+6)(x-7)=x^2+mx+n,则m=( -1 ),n=( -42 )
已知x+1/x=3,则x^2+1/x^2= 4.25
这些都有公式吧。。。
1.(x+y)(x-y)=x^2-y^2
.(x+y)(x-y)(x^2+y^2)=x^4-y^4
2.x^2+mx+1/4 =(x+(-)1/2)^2
m=1或-1
3.(3x^4)(y^3)(z^2)
4.(x+6)(x-7)=x^2-x-42
m=-1 n=-42
5..(x+1/x)^2=x^2+1/x^2+2=9
x^2+1/x^2=7
1.(x+y)(x-y)(x^2+y^2)=( x^4-y^4 )
2.若x^2+mx+1/4 是一个完全平方式,则m的值为( 1 )
3.12x^7y^6z^5÷( 3x^4y^3z^2 )=4x^3y^3z^3
4.若(x+6)(x-7)=x^2+mx+n,则m=( -1 ),n=( -42 )
5.已知x+1/x=3,则x^2+1/x^2= 4.25