請回答下列問題~

1.)長方形的長是22.8cm,闊比長少15.3cm。長方形的面積是多少?
設長方形的面積是y cm^2:
y=22.8(22.8-15.3)
y=22.8(7.5)
y=171
所以長方形的面積是171cm^2

2.)A,B,C,D四個數的和是100。A和B兩數相同,C和D的平均數是27。A和B分別是?
設A和B分別是x
2x(27 x 2)=100
2x=100-54
2x=46
x=46/2
x=23
所以A和B分別是23

3.)毛巾每條售7.7元。文文有95.3元,她最多可買毛巾多少條?
95.3/7.7 =12.4
所以她最多可買毛巾12條

5.)果汁12罐售30元,可樂8罐售28元。一罐可樂的售價是一罐果汁的百分之幾?
一罐可樂的售價是一罐果汁的:
=(28/8)/(30/12) x 100%
=(3.5/2.5) x 100%
=140%
所以一罐可樂的售價是一罐果汁的140%

1. L = 22.8, W = 22.8-15.3 = 7.5

Area = W x L
Area = 22.8 x 7.5
Area = 171 cm2

2. A + B + C + D = 100...................(1)
A = B......................................(2)
C+D = 27 x 2 = 54........ sub into (1)

A + B + 54 = 100
A + B = 46 .............................(3)

Combine (2) and (3)...

A = B = 23


3. 95.3/7.7 = 12.37
Therefore, most = 12.

4. Coke = 28/8 = 3.5
Juice = 30/12 = 2.5

Coke/Juice x 100% = 3.5/2.5 x 100 = 140%

Coke is 140% to Juice

1.)22.8 x 15.3 = 348.84 所以長方形的面積是348.84
2.)(100-27) ÷ 2 = 36.5 所以A和B分別是36.5
3.)95.3 ÷ 7.7=12.29 所以可以買12條毛巾
5.)2.5 ÷ 3.5 = 1.4 所以等於百分之104

1.(22.8-15.3)x22.8
2.10027-27/2
3.95.3/7.7
4.i don ,s kown