要列式,中一數學題.
1.(+2)(+5) 2.(+5)(-2) 3.(-5)(-4) 4.(-15)(+2)除(-10) 5.-3-3x(-4)-(-2-2)
有向數答案
2008-10-01 2:19 am
回答 (2)
2008-10-05 2:42 am
1. (+2)(+5)
= (+)(+)(5)(2)
= +10
2. (+5)(-2)
= (+)(-)(5)(2)
= -10
3. (-5)(-4)
= (-)(-)(5)(4)
= +20
4. (-15)(+2)/(-10)
= (-)(+)(15)(2)/(-10)
= (-30)/(-10)
= (-)(-)[(30)/(10)]
= +3
5. -3-3x(-4)-(-2-2)
= -3-[(-)(-)(3x)(4)]-(-2)-(-2)
= -3+12x+4
= 12x+1
= (+)(+)(5)(2)
= +10
2. (+5)(-2)
= (+)(-)(5)(2)
= -10
3. (-5)(-4)
= (-)(-)(5)(4)
= +20
4. (-15)(+2)/(-10)
= (-)(+)(15)(2)/(-10)
= (-30)/(-10)
= (-)(-)[(30)/(10)]
= +3
5. -3-3x(-4)-(-2-2)
= -3-[(-)(-)(3x)(4)]-(-2)-(-2)
= -3+12x+4
= 12x+1
參考: me
2008-10-03 3:56 am
1.(+2)(+5)
=2(5)
=10
2.(+5)(-2)
= -(5)(2)
= -10
3.(-5)(-4)
=5(4)
=20
4.(-15)(+2)除(-10)
= -15(-5)
=75
5.-3-3x(-4)-(-2-2)
= -3+12x+2-2
=12x-3+2-2
=12x-3
=2(5)
=10
2.(+5)(-2)
= -(5)(2)
= -10
3.(-5)(-4)
=5(4)
=20
4.(-15)(+2)除(-10)
= -15(-5)
=75
5.-3-3x(-4)-(-2-2)
= -3+12x+2-2
=12x-3+2-2
=12x-3
參考: myself
收錄日期: 2021-04-15 18:30:41
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https://hk.answers.yahoo.com/question/index?qid=20080930000051KK01234