樓主想怎樣?只有數式沒有問題
純粹展開還是因式分解?
以下為因式分解的計法:
1. (x
2-4x-3)(x-2)
2-8
=(x
2-4x-3)(x
2-4x+4)-8
=(
x2-4x+0.5-3.5)(
x2-4x+0.5+3.5)-8
=(x
2-4x+0.5)
2-12.25-8
=(x
2-4x+0.5)
2-4.5
2 =(x
2-4x+5)(x
2-4x-4)
2. (x-1)(x-2)(x+3)(x+4)+6
=[(x-1)(x+3)][(x-2)(x+4)]+6
=(x
2+2x-3)(x
2+2x-8)+6
=(
x2+2x-5.5+2.5)(
x2+2x-5.5-2.5)+6
=(x
2+2x-5.5)
2-2.5
2+6
=(x
2+2x-5.5)
2-0.5
2 =(x
2+2x-5)(x
2+2x-6)
[ athrun在2009-10-20 17:00重新編輯此帖 ]