问题
解答题
已知:A=2x2-x+1,A-2B=x-1,求B.
答案
由A-2B=x-1,得
2B=A-(x-1)
2B=2x2-x+1-(x-1)
2B=2x2-x+1-x+1
2B=2x2-2x+2
B=x2-x+1
已知:A=2x2-x+1,A-2B=x-1,求B.
由A-2B=x-1,得
2B=A-(x-1)
2B=2x2-x+1-(x-1)
2B=2x2-x+1-x+1
2B=2x2-2x+2
B=x2-x+1