A store bought x newspapers yesterday.Half of them were sold in morning,1/4of them were sold in the afternoon,5 were sold at night and 30 were left finally.How many newspapers did the store buy yesterday?
我淨係列到條式:
x-1/2x-1/4x-5=30
之後唔識計..
中一數學題一問(急) (15點)
2007-10-14 12:32 am
回答 (4)
2007-10-14 12:38 am
✔ 最佳答案
x - 0.5x - 0.25x - 5 = 300.25x = 35
x = 140
2007-10-13 16:40:11 補充：
我recalculate過,140一定啱:如果x係140即in the morning賣左 0.5(140) = 70份in the afternoon賣左 0.25(140) = 35份之後最尾賣多左5份, 淨番30分70 35 5 30 = 140合題意, 合logic
2007-10-13 16:43:30 補充：
LET's x.....................................x-1/2x-1/4x-5=30x-(5 1/2x 1/4x)=30x-5又3/4x=30x=35又3/4錯我詳細d講下@@x - (1/2x 1/4x 5) =30( )入面, 5同1/2x同1/4x, 頂多係1/2x同1/4x相加, 即3/4x,5都唔洗乘x, 有乜可能5可以同1/2x, 1/4x相加- -
2007-10-14 12:41 am
multiply the entire equation by 4:
4x-2x-x-20=120
x-20=120
x-20+20=120+20
x=140
The total number of newspaper the store bought is 140.
hope i can help la~ xDxD
4x-2x-x-20=120
x-20=120
x-20+20=120+20
x=140
The total number of newspaper the store bought is 140.
hope i can help la~ xDxD
參考: me
2007-10-14 12:37 am
x-(5+1/2x+1/4x)=30
x-5又3/4x=30
x=35又3/4
2007-10-13 16:39:27 補充：
LET's x..................................... x-1/2x-1/4x-5=30x-(5+1/2x+1/4x)=30 x-5又3/4x=30 x=35又3/4
x-5又3/4x=30
x=35又3/4
2007-10-13 16:39:27 補充：
LET's x..................................... x-1/2x-1/4x-5=30x-(5+1/2x+1/4x)=30 x-5又3/4x=30 x=35又3/4
參考: ME
收錄日期: 2021-04-13 13:53:40
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