1)25t二次-70t二次+49t
2)18x三次+60x二次yz+50xy二次
3)(a+b)二次+6(a+b)+a
4)(2c+3d)二次-6(2c+3d)+9(c-2d)二次
5)(h-k)二次-2(h-k)(h+k)+(h+k)二次
6)36ab+48a三次b二次+76ba
7)16d四次-8d二次+1
8)81h四次-72h二次+16
要有步驟,Thank you!
20點!8條因式分解
2007-02-11 8:01 pm
回答 (4)
2007-02-12 1:42 am
✔ 最佳答案
25t² - 70t² + 49t=49t - 45t²
=7t (7 - 5t )
18x³ + 60x²yz +50xy²
=[6x² (3x + 10yz ) ] +50xy²
(a + b)² + 6(a + b )+ a
=(a+b)[a+b+6]+a
(h-k)² - 2(h-k)(h+k) +(h+k)²
=[(h-k)-(h+k)]²
=(h-k-h-k)²
= -2k²
(2c+3d)² - 6(2c+3d) + 9(c-2d)²
=(2c+3)(2c+3d-6) + (3c-6d)²
36ab+48a³b² +76ba
= 112ab +48a³b²
= 16ab(7+3a²b)
16d ^4 -8d²+1 (^4 = 四次)
=(4d²-1)²
81h^4-72h²+16 (^4 = 四次)
=(9h²-4)
2007-02-25 9:04 pm
有D答案唔係最簡~
例如:
16d ^4 -8d²+1 (^4 = 四次)
=(4d²-1)²
應係
= [( 2d+1 )( 2d-1 )]²
例如:
16d ^4 -8d²+1 (^4 = 四次)
=(4d²-1)²
應係
= [( 2d+1 )( 2d-1 )]²
2007-02-12 4:23 am
唔好找人幫做你做功課啦 你計個幾題就識啦
2007-02-11 10:25 pm
去問同學啦
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