一元一次其實小學有教
元係個未知數(eg:x,y...),次係個次數(eg:x1,x2)
x1既1可以唔洗寫,直接寫成x
x2其實姐係寫x×x(兩個x既product)
一元一次方程姐係一個未知數,次數為一
eg.
2x+3=6
2x+3-3=6-3 <-balance
因為左面同右面有等價關係,左面冇左3,右面都會同時冇左3(目的係想變走個2x+3既3)
2x=3 (熟習左可以直接變黎呢步,上面個步既"3-3"其實可以唔洗寫)
2x/2=3/2 (目的係變走埋個2,令到個x變成得自己一個,呢個都係最終想得到既野)
x=3/2 (再熟習d可以直寫答案-.-)
2# -終場ソ使者-
我都係中1,
但係2樓...
你玩野呀...
正正得正,正負得負,負正得正,負負得正,背左佢
負正得正-___-!?
唔係負正得負咩,
唔好教衰曬D人-口-
12# ｌikｅ抽筋
我打錯左姐,唔洗咁執著
正正得正 ++=+
負負得正 --=+
正負得負 +-=-
負正得負 -+=-
如:-1+(-1) 只睇紅色,正負得??,正負得正
=-1+1
=0
-1-1=-2
-1+1=0
回復 6# 【YU】
x+1 = 3
x = 2
a u crazy?
just a reminded for students
not a right explained
望._. 發表於 27-9-2010 20:42 http://www4.nakuz.com/bbs/images/common/back.gif
Many students, including high form's still don't know the basic explanation of these simple algebraic theories, can you mathematically explain to the pupils and ensure most of them understant what you explained?