若3a+1与a-4互为相反数,则=

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若3a+1与a-4互为相反数,则=若3a+1与a-4互为相反数,则=若3a+1与a-4互为相反数,则=3a+1=-(a-4)4a-3=0a=3/4由(3a+1)+(a-4)=0得a等于0.753a+1

若3a+1与a-4互为相反数,则=
若3a+1与a-4互为相反数,则=

若3a+1与a-4互为相反数,则=
3a+1=-(a-4)
4a-3=0
a=3/4

由(3a+1)+(a-4)=0得a等于0.75

3a+1=-(a-4)
4a=3
a=3/4

0.75

若3a+1与a-4互为相反数,则a=3/4
3a+1=-a+4
4a=3
a=3/4

你是不是想问a=?. a=3/4. 依题意得3a+1=-(a-4),展开后合并同类项就可以求解a得3/4