若 p = 2 及 q = -3時以下的數式的值
(p^ - 4pq + q^) - (p^ + 4pq - q^)
註： ^ = 2次方
唔該哂!
又一條數學題.........
2006-11-07 7:05 am
回答 (6)
2006-11-07 7:11 am
✔ 最佳答案
(p^ - 4pq + q^) - (p^ + 4pq - q^)=p^ - 4pq + q^ - p^ - 4pq + q^
= -8pq+ 2q^
= -8 X 2 X -3 + 2 X 9
=48 + 18
=66
2006-11-07 7:31 am
因式分解:
(p^ - 4pq + q^) - (p^ + 4pq - q^)
=[2^ - ( 4 )( 2 )( -3 ) + 3 ^ ] - [ 2^ + ( 4 )( 2 )( 3 )- 3^ ]
=[ 4 - ( - 24 ) + 9 ] - [ 4 + 24 - 9 ]
=[ 4 + 24 + 9 ] + [ 4 - 24 + 9 ] <------[[後面要抽符號]]
=( 2 + 9 )^ +( 2 - 9 )^
答可能係: ( 2 + 9 ) ^ +( 2 - 9 ) ^
普通的:
(p^ - 4pq + q^) - (p^ + 4pq - q^)
=[2^ - ( 4 )( 2 )( -3 ) + 3 ^ ] - [ 2^ + ( 4 )( 2 )( 3 )- 3^ ]
=[ 4 - ( - 24 ) + 9 ] - [ 4 + 24 - 9 ]
= 4 + 24 + 9 - 4 - 24 + 9
= 18
(p^ - 4pq + q^) - (p^ + 4pq - q^)
=[2^ - ( 4 )( 2 )( -3 ) + 3 ^ ] - [ 2^ + ( 4 )( 2 )( 3 )- 3^ ]
=[ 4 - ( - 24 ) + 9 ] - [ 4 + 24 - 9 ]
=[ 4 + 24 + 9 ] + [ 4 - 24 + 9 ] <------[[後面要抽符號]]
=( 2 + 9 )^ +( 2 - 9 )^
答可能係: ( 2 + 9 ) ^ +( 2 - 9 ) ^
普通的:
(p^ - 4pq + q^) - (p^ + 4pq - q^)
=[2^ - ( 4 )( 2 )( -3 ) + 3 ^ ] - [ 2^ + ( 4 )( 2 )( 3 )- 3^ ]
=[ 4 - ( - 24 ) + 9 ] - [ 4 + 24 - 9 ]
= 4 + 24 + 9 - 4 - 24 + 9
= 18
2006-11-07 7:18 am
(p^ - 4pq + q^) - (p^ + 4pq - q^)
=p^ - 4pq + q^ - p^ - 4pq + q^
= -8pq+ 2q^
= -8 X 2 X -3 + 2 X 9
=48 + 18
=66
=p^ - 4pq + q^ - p^ - 4pq + q^
= -8pq+ 2q^
= -8 X 2 X -3 + 2 X 9
=48 + 18
=66
2006-11-07 7:12 am
答案66...將d數代入式...得..37+29....答案66
2006-11-07 7:12 am
(p^ - 4pq + q^) - (p^ + 4pq - q^)
即是:
[(2)^-4(2)(-3)+(-3)^]-[(2)^+4(2)(-3)-(-3)^]
=4+24+9-4-24+9
=18
即是:
[(2)^-4(2)(-3)+(-3)^]-[(2)^+4(2)(-3)-(-3)^]
=4+24+9-4-24+9
=18
2006-11-07 7:09 am
-8pq=(-8)(2)(-3)=48
2006-11-06 23:17:34 補充：
算漏了 ＋２ｑ＾ 一項正確答案 ６６！
2006-11-06 23:17:34 補充：
算漏了 ＋２ｑ＾ 一項正確答案 ６６！
收錄日期: 2021-04-12 22:51:58
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https://hk.answers.yahoo.com/question/index?qid=20061106000051KK05113