题目内容
[ ]
下列各式的计算中, 结果错的是
A. 3x(2x-1)＝6x2-3x B. (2x-3)(3x-1)＝6x2-11x+3
C. (x+1)(x2+x+1)＝x3+x2+x D. (1-x)(x+1)＝1-x2
A. (xm+1y-2x2m+3ym-1)(-xmym)2
＝x3m+1y2m+1-2x4my2m+3x2my3m-1
B.
C.
＝-2x4n+1y-x4n+2y2+x4n+4yn
D. (a2n+3xn+3-3a2n+1xn+2+5an+1xn+1+6anxn)(-an+1x)
＝-a3n+4xn+4-3a3n+2xn+3+5a2n+2xn+2+6a2n+1xn+1
x