有冇人識呢題~數學~

The cakes sold today
250*(1-10%) = 225

The bread sold today
400*(1+15%) = 460

The total number of cakes and bread sold today
225+460 = 685

2007-08-18 18:57:43 補充：
基本上所有回答的方法都是一樣的首先我們計出今天蛋糕賣出的數目昨天賣出250個,, 而今天賣的比昨天少了10%, 所以(1-10%), 即是今天只賣了昨了的90%(九成), 250個*90% 就計出今天賣了225個你也可以寫成 250 - (250*10%) = 225這裡 我們先計出 250個的10%是 25個然後以昨天的250減去10% 即是25那得出的結果還是 今天賣出了225個

2007-08-18 19:00:08 補充：
致於麵包 昨了賣了 400個, 今天多賣了15%換個方法算400 (400*15%) = 460400*15% 是計出今天比昨天多出15%的數目, 即是 60個然後加上昨天的400個 , 400 60 = 460由此得出今天賣了460個麵包最好把今天賣的蛋糕和麵包總數加起來225 460 = 685就知道今天總共賣了的蛋糕和麵包685個

the number of cakes sold today:250x(1-10%)
=250x(1-0.1)
=225
the number of bread sold today:400x(1+15%)
=400x(1+0.15)
=400X(1.15)
=460
the total number of cakes and bread sold today=225+460
=685

The total number of cakes and bread sold today

250x(1-10%)
=250x90%
=250x90/100
=225 cakes

400x(1+15%)
=400x115%
=400x115/100
=460 breads
.
. . the total number of cakes and bread sold today is 685 .

250*(1-10%)+400*(1+15%)=685
The number of cakes sold today is decreased by 10% :
250*(1-10%)=225
The number of bread sold today is increased by 15%:
400*(1+15%)=460
The total number of cakes and bread sold today.
225+460=685

225cakes and 460bread

250(1+0.1) + 400(1+0.15) = 735.

Shadow.

2007-08-14 16:33:23 補充：
應該係:250(1-0.1)+400(1+0.15)=685.Shadow.

250*0.9+400*1.15 = 685

Today Sold Cakes = 250 - 10% = 250 - 25 = 225
Today Sold bread = 400 + 15% = 400 + 60 = 460