若式子﹙2X²+AX-Y+6﹚-﹙2BX²-3X+5Y-1﹚的值与x无关求½A²-2B+4AB
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 03:41:32
![若式子﹙2X²+AX-Y+6﹚-﹙2BX²-3X+5Y-1﹚的值与x无关求½A²-2B+4AB](/uploads/image/z/6919105-49-5.jpg?t=%E8%8B%A5%E5%BC%8F%E5%AD%90%EF%B9%992X%26%23178%3B%EF%BC%8BAX%EF%BC%8DY%EF%BC%8B6%EF%B9%9A%EF%BC%8D%EF%B9%992BX%26%23178%3B%EF%BC%8D3X%EF%BC%8B5Y%EF%BC%8D1%EF%B9%9A%E7%9A%84%E5%80%BC%E4%B8%8Ex%E6%97%A0%E5%85%B3%E6%B1%82%26%23189%3BA%26%23178%3B%EF%BC%8D2B%EF%BC%8B4AB)
若式子﹙2X²+AX-Y+6﹚-﹙2BX²-3X+5Y-1﹚的值与x无关求½A²-2B+4AB
若式子﹙2X²+AX-Y+6﹚-﹙2BX²-3X+5Y-1﹚的值与x无关求½A²-2B+4AB
若式子﹙2X²+AX-Y+6﹚-﹙2BX²-3X+5Y-1﹚的值与x无关求½A²-2B+4AB
(2x²+ax-y+6)-(2bx²-3x+5y-1)
=2x²+ax-y+6-2bx²+3x-5y+1
=(2-2b)x^2+(a+3)x-6y+7
(2x²+ax-y+6)-(2bx²-3x+5y-1)的值与字母x的取值无关,即x的系数都为零
即2-2b=0,a+3=0
b=1,a=-3
½a²-2b+4ab
=½(-3)²-2×1+4×(-3)×1
=4.5-2-12
=-9.5