我想問點算?(數學)(獲選最佳解答+20)

2007-01-06 10:23 pm
我唔識算呀!(五年級數學)......正俾(音)例

1.買入場卷5張,共需75元。現多買3張,需付幾元?
2.買入場卷5張,共需75元。現少買3張,可少付幾元?
3.買入場卷5張,共需75元。現多買3張,需多付幾元?

請注意:每題都有陷阱!

乘數符號:X
除數符號:÷

回答 (8)

2007-01-06 10:30 pm
✔ 最佳答案
1. 75÷5X(5+3)
=15x8
=120
需付$120

2. 75-75÷5X(5-3)
=75-15x2
=75-30
=45
可少付$45

3. 75÷5X(5+3)-75
=15x8-75
=120-75
=45
需多付$45
2007-01-07 12:47 am
1.買入場卷5張,共需75元。現多買3張,需付120元
2.買入場卷5張,共需75元。現少買3張,可少付45元
3.買入場卷5張,共需75元。現多買3張,需多付45元
參考: me
2007-01-06 10:38 pm
1.需付:
75÷5X(5+3)
=15X(5+3)
=15X8
=120(元)

2.少付:
75-(75÷5)X3
=75-15X3
=75-45
=30(元)

3.多付:
(75÷5)X3
=15X3
=45(元)
參考: ME......
2007-01-06 10:34 pm
1. 75+75÷5X3
=75+45
=$120

2. 75÷5X3
=45
 
3. 75÷5X3
 =45 
參考: 自己
2007-01-06 10:34 pm
1.買入場卷5張,共需75元。現多買3張,需付幾元?
75÷5X(5+3)
=15x8
=120
需付$120

2. 買入場卷5張,共需75元。現少買3張,可少付幾元?
75-75÷5X(5-3)
=75-15x2
=75-30
=45
可少付$45

3.買入場卷5張,共需75元。現多買3張,需多付幾元?
75÷5X(5+3)-75
=15x8-75
=120-75
=45
需多付$45
參考: me
2007-01-06 10:33 pm
1. 每張入場卷需15元.
多買3張,需付 15X8=120 元

2. 少買3張,需付 15X2=30 元
可少付 75-30=45 元,即是3張入場卷的價錢

3. 需多付 120-75=45 元,即是3張入場卷的價錢

It's rather easy..
參考: myself
2007-01-06 10:32 pm
1)75÷5x8=15x8=120
2)75÷5x3=45
3)75÷5x3=45
2007-01-06 10:31 pm
1.買入場卷5張,共需75元。現多買3張,需付120元
2.買入場卷5張,共需75元。現少買3張,可少付45元
3.買入場卷5張,共需75元。現多買3張,需多付45元


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