假設y= 負2
1 . 4-y=
2 . 4y二次方=
3 . 8+y二次方=
功課 help math................................................
2007-10-11 6:17 pm
回答 (5)
2007-10-11 7:17 pm
✔ 最佳答案
1. 4-y= 4-(-2)=4+2=6 (負負得正, - (-2) = +2)2. (4y)2= 4y*4y= 4*(-2) * 4*(-2) = -8 * -8 =+16 (負負得正)
3. (8+Y)2 = (8+y) * (8+y) = (8 + (-2)) * (8+ (-2)) = (8-2) *(8-2) = 6 * 6 = 36 (正負得負, 8+ (-2) = 8-2=6)
注: 二次方打唔到出黎, 正確寫法應為 ( ) 外右上方
2007-10-12 1:53 am
1. 4-y=4-(-2)
=4+2
=6
2. 4y二次方=4(-2)二次方
=4(4)
=16
3. 8+y二次方=8+(-2)二次方
=8+4
=12
=4+2
=6
2. 4y二次方=4(-2)二次方
=4(4)
=16
3. 8+y二次方=8+(-2)二次方
=8+4
=12
2007-10-11 6:27 pm
1. (4-y)2
=(4-y)(4-y)
=16-8y+y2
2. (4y) 2
=16y2
3 (4+y) 2
=(4+y)(4+y)
=16+8y+y2
=(4-y)(4-y)
=16-8y+y2
2. (4y) 2
=16y2
3 (4+y) 2
=(4+y)(4+y)
=16+8y+y2
2007-10-11 6:25 pm
假設y= 負2
1. 4-y=6 [4-(-2)]
2. 4y二次方=-16 (4 y二次方,,只係個-2有份,,四冇二次方)
3. 8+y二次方=8+(-2)二次方=8+2=10
2007-10-11 10:26:46 補充：
樓上個個,,no.2 = -16呀
2007-10-11 10:27:38 補充：
仲有我個題係3. 8 y二次方=8 (-2)二次方=8 2=12唔係10,,打錯
1. 4-y=6 [4-(-2)]
2. 4y二次方=-16 (4 y二次方,,只係個-2有份,,四冇二次方)
3. 8+y二次方=8+(-2)二次方=8+2=10
2007-10-11 10:26:46 補充：
樓上個個,,no.2 = -16呀
2007-10-11 10:27:38 補充：
仲有我個題係3. 8 y二次方=8 (-2)二次方=8 2=12唔係10,,打錯
2007-10-11 6:24 pm
1. +6
2. +16
3. +12
2. +16
3. +12
收錄日期: 2021-04-23 23:43:44
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