小６數學 - 方程

1. ２ｔ ｘ４９.５％ = １９.８ｔ
2t x 495.1000 = 198/10 t
99/100t = 198/10 t
99/100 x 10/198 = t
1/2 = t

2.ｄ-０.２／０.０４ = ５ｄ = ?
d - 0.5 = 5d
d = 0.05


3.Ａ(１-１５％)x１.５Ａ = ４.７
A(1-15/100) 1.5A =4.7
85/100A x 1.5A =4.7
51/40A =47/10
A = 47/10 x 40/51
A = 188/51
A = 3.686274509

question1)is 2t*49.5%=19.8?
If is,the answer is:t=20
b)d=10

Ａ(１-１５％)*１.５A = ４.７??
A*85%*1.5A=4.7
1.275A^2=4.7
A^2=3.686
A=1.92
Is 1.5A*(1-15%)=4.7?
If is.
1.5A*(1-15%)=4.7
1.5A*85%=4.7
1.275A=4.7
A=3.69

1. t=20
2. d=10
3. Ａ(１-１５％)１.５Ａ = ４.７
(Ａ-０.１５A)１.５Ａ =４.７
(0.85A)1.5A=4.7
1.275AA=4.7
0.271276595=AA
A=0.520842198
小６數學 - 方程