5x-(30-x)=60
x=?
Maths question...
2006-10-20 5:56 am
回答 (10)
2006-10-20 3:53 pm
✔ 最佳答案
5x-(30-x)=60問題係咁既,
5x-30+x=60
先除左括號,
負正得負-(30)=-30
負負得正-(-x)=x
6x-30=60
簡化x,
6x-30 +30 =60 +30
各加30
6x=90
得數
(6x)/6=90/6
各除以6
x=15
得數
2006-10-21 6:33 am
5x-30+x=60
6x-30=60
6x=60+30
x=90/6
x=15
6x-30=60
6x=60+30
x=90/6
x=15
2006-10-20 6:32 am
5x-30+x=60
6x-30=60
6x=60+30
6x=90
x=15
6x-30=60
6x=60+30
6x=90
x=15
2006-10-20 6:04 am
5x-(30-x)=60
5x-30+x=60
6x-30+30=60+30
6x=90
6x/6=90/6
x=15
5x-30+x=60
6x-30+30=60+30
6x=90
6x/6=90/6
x=15
2006-10-20 6:02 am
5x-(30-x)=60
5x-30+x=60
6x-30=60
6x-30+30=60+30
6x = 90
x = 15
5x-30+x=60
6x-30=60
6x-30+30=60+30
6x = 90
x = 15
2006-10-20 5:59 am
5x-(30-x)=60
5x-30+x=60
6x-30=60
6x=60+30
6x=90
x=90/6
x=15
5x-30+x=60
6x-30=60
6x=60+30
6x=90
x=90/6
x=15
2006-10-20 5:59 am
5x-(30-x)=60
5x-30+x=60
6x-30=60
6x-30+30=60+30
6x = 90
x = 15
5x-30+x=60
6x-30=60
6x-30+30=60+30
6x = 90
x = 15
2006-10-20 5:58 am
5x-(30-x)=60
5x - 30 + x = 60
5x + x = 60 + 30
6x = 90
x = 15
2006-10-19 22:03:35 補充：
若一題數包含有括號的話, 請留意括號外的那個符號, 是負(-)的話, 括號裹的數就要由正變負, 負變正了.5x-(30-x)=605x - 30 + x = 60>>> -30 + x 這便是例子.
5x - 30 + x = 60
5x + x = 60 + 30
6x = 90
x = 15
2006-10-19 22:03:35 補充：
若一題數包含有括號的話, 請留意括號外的那個符號, 是負(-)的話, 括號裹的數就要由正變負, 負變正了.5x-(30-x)=605x - 30 + x = 60>>> -30 + x 這便是例子.
2006-10-20 5:58 am
5x-(30-x)=60
5x-30+x=60
6x=90
x=15
5x-30+x=60
6x=90
x=15
收錄日期: 2021-04-18 19:50:55
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