计算 (x-3)²-x+3
问题描述：
计算 (x-3)²-x+3
第二题 (2a²-3b²+2)(2-2a²+3b²)
答
(x-3)²-x+3= (x-3)²-(x-3)= (x²-6x+ 9 -1 )( x-3) = (x² -6x + 8 ) (x-3) = (x -4 ) (x-2 ) (x-3 ) (2a²-3b²+2)(2-2a²+3b²) = [2 +(2a²-3b²)][2 -(2a...