6. 下列哪一個是 x 的多項式?(A)2x+2/x(B)x2+x/2(C)︱x+1︱+3(D)2(x+1)+3=0
【用戶】楊
【年級】幼兒園下
【評論內容】(A) 2X+2/X = 2X2+2=2(X2+1) (B) X2+X/2 = 2X2+X = X(2X+1)(C)︱x+1︱+3-> ︱x+1︱=-3 ->(︱x+1︱)2=(-3)2=X2+2X+1=9 ->X2+2X-8=0 -> (X+4)(X-2)=0(D)2(X+1)+3=0 -> 2X+5=0