0.0021 50-X
-------- = ----------
0.003 X
要怎麼計算,求X
2006-10-27 21:49:10 · 2 個解答 · 發問者 ? 1 in 教育與參考 ➔ 其他：教育
如果你的題目是0.0021/0.003=50-X/X
首先先交叉相乘
讓【0.003*（50-X）】=（0.0021*X）
=> （0.15-0.003X）=0.0021X
再移項
=> 0.15=0.0051X
=>X=0.15/0.0051
=>X=29.411765
這樣算對嗎?
2006-10-27 21:58:28 · answer #1 · answered by 陳小孟 2 · 0⤊ 0⤋
(0.0021/0.003)=(21/30)=(7/10)=(50-X)/(X)交叉相乘7X = 10(50-X)7X = 500-10X17X = 500X = 500/17
2006-10-27 21:53:29 · answer #2 · answered by ~~初學者六級~~ 7 · 0⤊ 0⤋