式子﹙2x²﹢3ax-y﹚-2﹙bx²-3x+2y-1﹚的值与字母x的取值无关,式子﹙a-b﹚-﹙a-b﹚的值
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式子﹙2x²﹢3ax-y﹚-2﹙bx²-3x+2y-1﹚的值与字母x的取值无关,式子﹙a-b﹚-﹙a-b﹚的值式子﹙2x²﹢3ax-y﹚-2﹙bx²-3x+2y
式子﹙2x²﹢3ax-y﹚-2﹙bx²-3x+2y-1﹚的值与字母x的取值无关,式子﹙a-b﹚-﹙a-b﹚的值
式子﹙2x²﹢3ax-y﹚-2﹙bx²-3x+2y-1﹚的值与字母x的取值无关,式子﹙a-b﹚-﹙a-b﹚的值
式子﹙2x²﹢3ax-y﹚-2﹙bx²-3x+2y-1﹚的值与字母x的取值无关,式子﹙a-b﹚-﹙a-b﹚的值
﹙2x²﹢3ax-y﹚-2﹙bx²-3x+2y-1﹚=(2-2b)x^2+(3a+6)x-5y+2,
因为式子的值与字母x的取值无关,所以 2-2b=0,b=1,3a+6=0,a=-2,
式子﹙a-b﹚-﹙a-b﹚=0-0=0
a=-2
b=1
代进去算吧