2x² 5x-7 因式分解
问题描述:
2x² 5x-7 因式分解
答
2x²-5x+7
=(x+1)(2x-7)
x 1
×
2x ﹣7
2x²+5x-7
=(x-1)(2x+7)
x ﹣1
×
2x 7