# 小六問題數學~~高手入~20點

thxthxthx!!!!!!!

Rating
• 9 years ago

1. Let y be the original price of dictionary.

y-(y*95%)=9

y-0.95y=9

0.05y=9

y=180

The original price of the dictionary is \$180.

2. Let x be the original price of painting tools.

x*(1-5%)=513

x=513/0.95

x=540

The original price of the painting tools is \$540.

3.Let the original price of school bag be d.

d-(d*80%)=40

d-0.8d=40

0.2d=40

d=200

The original price of the school bag is \$200.

4.Let p be the original price of ring.

p-(p*75%)=250

p-0.75p=250

0.25p=250

p=1000

The original price of the ring is \$1000.

5.Let k be the original price of the tailored pants.

k*(1-15%)=255

0.85k=255

k=300

The original price of the tailored pants is \$300.

2011-05-31 15:27:03 補充：

拜托唔好抄襲答案!!!!!!!

Source(s): myself
• Anonymous
9 years ago

我估小六個陣應該係要用中文列式答掛?._.

字典的原價是：

9 ÷ (1 - 95%)

= 9 ÷ 5%

= 9 × 100/5

= 180元

畫具的原價是：

513 ÷ (1 - 5%)

= 513 ÷ 95%

= 513 × 100/95

= 540元

書包的原價是：

40 ÷ (1 - 80%)

= 40 ÷ 20%

= 40 × 100/20

= 200元

戒指的原價是：

250 ÷ (1 - 75%)

= 250 ÷ 25%

= 250 × 100/25

= 1000元

戒指的售價是：

250 ÷ (1 - 75%) - 250

= 250 ÷ 25% - 250

= 250 × 100/25 - 250

= 1000 - 250

= 750元

西褲的原價是：

255 ÷ (1 - 15%)

= 255 ÷ 85%

= 255 × 100/85

= 300元

買一條西褲省了：

255 ÷ (1 - 15%) - 255

= 255 ÷ 85% - 255

= 255 × 100/85 - 255

= 300 - 255

= 45元

哇搞掂 我唸D格式啱一般小學掛

希望幫到你啦:D

• 9 years ago

簡單！不用方程式!

1.9除(1-95%)=9除5%=180元

2.513除(1-5%)=513除95%=540元

3.40除(1-80%)=40除20%=200元

4.250除(1-75%)=250除25%=1000元

5.原價：255除(1-15%)=255除85%=300元

省：300-255=45元

你不覺得方程式麻煩些嗎？

2011-06-02 19:28:09 補充：

rai******你的答案和我的答案十分相似，我先答的，你抄襲我嗎？

Source(s): 自己