點計 40-50% X =20(方程)
回答 (7)
2008-12-07 12:56 am
✔ 最佳答案
40-50% X= 2040-0.5X =20
40 =20+0.5X
40-20 =20+0.5X-20
20 =0.5x
20./0.5=0.5X/0.5
X=40
講解：40-50% X =20，當我們遇到減未知數，先把他撥搬到右方，50%X=0.5X。所以變成40=20+0.5X。我們跟着要處理20，我們在左方和右方都-20，就會變成20=0.5X。我們跟住要將0.5X的0.5消滅，我在上方用了除0.5，也可以左方和右方一起乘以2，變成40=X，即X=40
參考: me
2008-12-06 9:33 pm
40-50%X=20
40-50%X/50%=20/50%
40-X=20x50/100
40-X=40
40-X+40=40+40
X=80
40-50%X/50%=20/50%
40-X=20x50/100
40-X=40
40-X+40=40+40
X=80
參考: need not to know
2008-12-06 8:54 pm
40-50% X =20
40-20=50%X
20=0.5X
X=40
40-20=50%X
20=0.5X
X=40
2008-12-06 8:51 pm
40-50%x=20
40-50%x+50%x=20+50%x
40=20+50%x
40-20=20+50%x-20
20=50%x
20/50%=x
40=x
x =40
40-50%x+50%x=20+50%x
40=20+50%x
40-20=20+50%x-20
20=50%x
20/50%=x
40=x
x =40
參考: me
2008-12-06 8:50 pm
40 - 50%x = 20
40 - 0.5x = 20
40 - 0.5x - 40 = 20 -40
-0.5x/0.5 = -20/0.5
x = 40
Hope I helped =]
40 - 0.5x = 20
40 - 0.5x - 40 = 20 -40
-0.5x/0.5 = -20/0.5
x = 40
Hope I helped =]
2008-12-06 8:50 pm
40-50% X =20
40=20+50%X
40-20=50%X
20=50%X
40=X
X=40
40=20+50%X
40-20=50%X
20=50%X
40=X
X=40
2008-12-06 8:49 pm
40-50% X = 20
-50% X = 20-40
-50% X = -20
50% X = 20
X = 20/0.5 = 20 x 2
X = 40
-50% X = 20-40
-50% X = -20
50% X = 20
X = 20/0.5 = 20 x 2
X = 40
收錄日期: 2021-04-13 16:18:16
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081206000051KK00521