7X-2X-1/2=21點計?要步驟
回答 (6)
2007-11-07 2:51 am
✔ 最佳答案
7X-2X-1/2=215x=21.5
x=4.3
2007-11-08 2:12 am
7X-2X-1/2=21
7X-2X=21+1/2
5X=21.5
X=4.3
Substitute X into the formula.
7(4.3)-2(4.3)-1/2=21
30.1-8.6-0.5=21
21.5-0.5=21
21=21
THe answer is correct.
7X-2X=21+1/2
5X=21.5
X=4.3
Substitute X into the formula.
7(4.3)-2(4.3)-1/2=21
30.1-8.6-0.5=21
21.5-0.5=21
21=21
THe answer is correct.
參考: Me
2007-11-07 3:12 am
7x-2x-1/2=21
7x-2x-0.5=21
5x-0.5=21
5x=21+0.5
5x=21.5
x=21.5/5
x=4.3
7( 4.3 ) - 2( 4.3 )-0.5=21
30.1-8.6-0.5=21
7x-2x-0.5=21
5x-0.5=21
5x=21+0.5
5x=21.5
x=21.5/5
x=4.3
7( 4.3 ) - 2( 4.3 )-0.5=21
30.1-8.6-0.5=21
參考: me
2007-11-07 2:55 am
7x-2x-1/2=21
5x-1/2=21
5x=21+1/2
x=21.5/5
x=4.3
5x-1/2=21
5x=21+1/2
x=21.5/5
x=4.3
2007-11-07 2:55 am
呢題可以有2個做法
因為我唔肯定你既問題
一.
(7X-2X-1)/2=21
(7X-2X-1)=21x2
5X-1=42
5X=43
X=43/5
二.
7X-2X-1/2=21
7X-2X=21+(1/2)
5X=43/2
X=43/10
因為我唔肯定你既問題
一.
(7X-2X-1)/2=21
(7X-2X-1)=21x2
5X-1=42
5X=43
X=43/5
二.
7X-2X-1/2=21
7X-2X=21+(1/2)
5X=43/2
X=43/10
收錄日期: 2021-04-13 14:21:51
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