百分率的計算

1. 1000 X (30% + 50%) = 800 毫升
2. 50-[50 X (20% + 16%)] = 50 - 18 = 32 塊
3. 160 X 85% = 136 塊
4. 120 + 120 X 15% = 120 + 22.5 =142.5 厘米
5. 26 X (25% - 20%) = 26 X 5% = 1.3 元
6. 82 ÷ (100% - 18%) = 82 ÷ 82% = 100 塊

1, 1升=100毫升
so Yesterdaty I drink about 30ml, 100*(0.3)=30
Then, we still have about 70ml, 100*(1-0.3)=70
Today, I drink about 35ml,70*(0.5)=35
At last we drink about 65ml as 30+35=65


2, 50*(1-0.2)( 1-0.16)=33.6塊 so we still have a 33

3, 160*85/100=136g

4 120*(1+0.15)=138

5, Yesterday elder brother spending :36*0.2=7.2
Today, he spend :(36-7.2)*0.25=7.2
so he doesn;t have 昨天比今天少用 that probem
6, let x be the total of the biscuit numbers
X *(1-0.18)=82
X*0.82=82
X=100
Finally, the total of the biscuit numbers is 100

1)1升=1000毫升
(1000x30%)+(1000x1/2)
=300+500
=800毫升
2)威化餅還餘:
50x(50x20%+50x16%)
=50-(10+8)
=50-18
=32塊
3)妹妹有朱古力糖:
60x85%
=136克
4)他今年身高:
=120x115%
=138厘米
5)昨天用:36x20%
=7.2元
今天用:(36-7.2)x25%
=7.2元
'.'昨天比今天少用0元
6)這盒曲奇餅原有:
2x(100/100-18%)
=100塊

1)(1000x30%)+(1000x50%)=800毫升
2)50 - { ( 1 x 20 % ) + ( 1 x 16 % ) }=32塊
3)160x85%=136克
4)120+(120x15%)=138厘米
5)(36x25%)-(36x20%)=1.8元
6) X(英文)

1. 1升=1000毫升
1x(30%+50%)=1000x80%=800毫升

2. 50x(1-20%-16%)=50x64%=32塊

3. 160x85%=136克

4. 120x(1+15%)=120x115%=135厘米

5. 36x(25%-20%)=36x5%=1.8元

6. 82/18%=100塊

2006-11-15 18:43:49 補充：
6. 82/(1-18%)=82/82%=100塊

1.)1000x(30%+50%)=800ml
2.)50x(1-20%-16%)=32
3.)160x85%=136g
4.)120x(1+15%)=138cm
5.)昨天:36x20%=7.2
今天:36x25%=9
昨天比今天少用:9-7.2=$1.8
6.)82÷82%=100

1.)800
2.)32
3.)136(no sure)
4.)138
5.)1.8
6.)96(no sure)

1.1000X30%=300 300X50%=150 共喝了150毫升
2.50-(50X36%)=32
3.160X85%=136
4.120X(1+15%)=138
5.36X5%=1.8
6.設A
A-(AX18%)=82
A=100