在「2x + 3 = 7」中，x是什麼？
2007-01-12 18:01:46 · 33 個解答 · 發問者 Chan 3 in 科學 ➔ 數學
x是一個未知數
題目的目的是找出一個數
令到這個算式中的左方等於右方
這條算式中
2x + 3 - 3 = 7 - 3
2x = 4
2x/ 2 = 4 / 2
x = 2
2007-01-12 18:05:50 · answer #1 · answered by ? 3 · 0⤊ 0⤋
2x + 3 = 7
2x=7-3
2x=4
x=4/2
x=2
2007-01-13 17:53:17 · answer #2 · answered by nicole 7 · 0⤊ 0⤋
2x + 3 = 7
2x=7-3
2x=4
x=4/2
x=2
2007-01-13 05:47:19 · answer #3 · answered by ABC 7 · 0⤊ 0⤋
我有個串d o既方法~~但係都係大同小異...
2x+3=7
2x/2+3/2=7/2 <-------全式除二
x+1.5=3.5
x=2
2007-01-13 03:58:12 · answer #4 · answered by Anonymous · 0⤊ 0⤋
2x+3=7
x=2
2007-01-12 20:00:25 · answer #5 · answered by ? 3 · 0⤊ 0⤋
X=2
2x2+3=7
2007-01-12 19:19:07 · answer #6 · answered by 莊主．東尼 3 · 0⤊ 0⤋
2x=7-3
2x=4
x=4/2
x=2
2007-01-12 18:19:35 · answer #7 · answered by ? 5 · 0⤊ 0⤋
x係代數
2x + 3 = 7
2x = 7 + 3
2x = 10
x = 10/2
x = 5
2007-01-12 18:06:34 · answer #8 · answered by ada 1 · 0⤊ 0⤋
算法:
2X = 7-3
2X = 4
X = 4/2
X = 2
2007-01-12 18:06:12 · answer #9 · answered by Gigi 3 · 0⤊ 0⤋
x=2
2x+3=7
2x=7-3
2x=4
x=2
2007-01-12 18:05:30 · answer #10 · answered by ? 2 · 0⤊ 0⤋
X=2
2x2+3=7
2007-01-12 18:04:48 · answer #11 · answered by chau yee 2 · 0⤊ 0⤋