若m,n互为相反数,则(3m-2n)-(2m-3n)=——————-{-[-(a+b)]}+{-[-(a-b)]}=__+5a^2bc=-10a^2bc如果1/5x^3y^m+ax^ny^4=0,则m=_,n=_,a=_
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若m,n互为相反数,则(3m-2n)-(2m-3n)=——————-{-[-(a+b)]}+{-[-(a-b)]}=__+5a^2bc=-10a^2bc如果1/5x^3y^m+ax^ny^4=0,则m=_,n=_,a=_
若m,n互为相反数,则(3m-2n)-(2m-3n)=——————
-{-[-(a+b)]}+{-[-(a-b)]}=
__+5a^2bc=-10a^2bc
如果1/5x^3y^m+ax^ny^4=0,则m=_,n=_,a=_
若m,n互为相反数,则(3m-2n)-(2m-3n)=——————-{-[-(a+b)]}+{-[-(a-b)]}=__+5a^2bc=-10a^2bc如果1/5x^3y^m+ax^ny^4=0,则m=_,n=_,a=_
(1)若m,n互为相反数,则(3m-2n)-(2m-3n)=0
(3m-2n)-(2m-3n)
=3m-2n-2m+3n
=m+n
=0
(2)结果为-2b
-{-[-(a+b)]}+{-[-(a-b)]} (负负得正)
=-(a+b)+(a-b)
=-a-b+a-b
=-2b
(3)填:-15a^2bc
-10a^2bc-5a^2bc
=-15a^2bc
(4)
如果1/5x^3y^m+ax^ny^4=0,则m=4_,n=_3,a=-1/5
1/5x^3y^m=-ax^ny^4
根据对应项相等得
a=-1/5
n=3
m=4
若m,n互为相反数
则m=-n
(3m-2n)-(2m-3n)=3m-2n-2m+3n=m+n=0
若m,n互为相反数,则(3m-2n)-(2m-3n)=5m-5m=0
-{-[-(a+b)]}+{-[-(a-b)]}=-(a+b)+(a-b)=-2b
-15a^2bc+5a^2bc=-10a^2bc
如果1/5x^3y^m+ax^ny^4=0,则m=4 ,n=3 ,a=-1/5 (x,y均不为0)
若m,n互为相反数,则(3m-2n)-(2m-3n)=0
-{-[-(a+b)]}+{-[-(a-b)]}=-2b
__+5a^2bc=-10a^2bc=-15a^2bc
如果1/5x^3y^m+ax^ny^4=0,则m=4,n=3,a=-1/5
(3m-2n)-(2m-3n)=3m-2n-2m+3n=m+n=0
1、m,n互为相反数,则m=-n,
——》(3m-2n)-(2m-3n)=(-3n-2n)-(-2n-3n)=0;
2、-{-[-(a+b)]}+{-[-(a-b)]}=-(a+b)+(a-b)=-2b;
3、_-15a^2bc_+5a^2bc=-10a^2bc;
4、m=4、n=3、a=-1/5。