题目内容
化简(3x2)3-7x3[x3-x(4x2+1)]等于
[ ]
化简 (10x3+7x2-2x-4)-3(x3-x2+1) 为
A.x3+10x2-2x-7 B.7x3+10x2+2x-7
C.7x3+10x2-2x+7 D.7x3+10x2-2x-7
A. 3x6-7x9+28x6-7x4=31x6-7x9+7x4
B. 9x6-7x6+7x6+7x3=9x6+7x3
C. 27x5-7x9-28x6-7x3
D. 27x6-7x6+28x6+7x4=48x6+7x4