一條數學問題有懷疑
3(x+4)=24
要有例式
答案
2007-06-10 12:43:50 · 3 個解答 · 發問者 pui ying 2 in 教育與參考 ➔ 小學及中學教育
解1:
3(x+4)=24
3x+12=24(因式ab+ac=a(b+c))
3x=12(移項+12>>-12)
x=4(天平原理:兩邊除以4)
解2:
3(x+4)=24
x+4=8(移項x3>>/3
x=4(移項+4>>-4)
驗算:
3x(4+4)
=3x8
=24
2007-06-11 14:21:22 · answer #1 · answered by nicholas 7 · 0⤊ 0⤋
3(x+4)=24
3(x+4)÷3=24÷3
x+4-4=8-4
x=4
2007-06-14 15:36:50 · answer #2 · answered by wongkam ling 2 · 0⤊ 0⤋
3(x+4)=24
x+4=24÷3
x=8-4
x=4
2007-06-10 12:48:55 · answer #3 · answered by ? 6 · 0⤊ 0⤋