我想問一元一次方程點做?10點

👨🏻‍🏫 學術台數學

[匿名]

2010-11-29 6:50 pm

1.P-2 = P
2

2. 8-P= P+16
>>>>>>>5<<<<<<<<<

更新1:

急急急!!!!!!

更新2:

THX!!

回答 (2)

Matt-owinawaa

2010-11-29 9:34 pm

✔ 最佳答案

第一題 :

(P-2)/2 = P ,兩邊都乘2

P-2 = 2P ,兩邊都減P

-2 =2P-P

P = -2

第二題:

8-P = (P+16)/5 將兩邊都乘5

40-5P = P+16 再同一類別既野放係一齊

-5P-P = 16-40

-4P = -24 再一齊除-4

-4P/-4 = -24/-4

P = 6

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用戶22403

2010-11-30 4:43 am

1.
(P-2)/2 = P
P-2 = 2P
-2 = 2P-P
P = -2

2.
8-P = (P+16)/5
5(8-P) = P+16
40-5P = P+16
40-16 = P+5P
24 = 6P
P = 24/6
P = 4

參考: girl

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