若代数式2x²+ax-5y+b-2bx²+3x-5y+1的值与字母x的取值无关,求代数式3(a²-ab-b²)-4a&s
人气:229 ℃ 时间:2019-08-20 11:23:57
解答
值与字母x的取值无关
2-2b=0,b=1
a+3=0,a=-3
3(a^2-ab-b^2)-4a^2
=...
后面自己做,会怀疑你题目不全
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