兩條方程題目

2007-05-19 5:42 am
呢兩條係小學程度的方程,請幫我將整條方程式及未知數的解列出來,謝謝!

1) 5s-20%=8.3

2) 2/5乘(r+75%)=1/2

回答 (10)

✔ 最佳答案
1) 5s-20%=8.3
5s-0.2=8.3
5s=8.3-0.2
5s=8.1
s=1.62

2) 2/5*(r+75%)=1/2
0.4*(r+0.75)=0.5
0.4r+3=0.5
0.4r=0.5-3
0.4r=-2.5
r=-6.25

2007-05-18 22:10:11 補充:
sorry...sorry, 計錯數呀!!!! .

2007-05-18 22:10:31 補充:
sorry...sorry, 計錯數呀!!!! .

2007-05-18 22:10:49 補充:
2) 2/5*(r 75%)=1/20.4*(r 0.75)=0.50.4r 0.3=0.50.4r=0.5-0.30.4r=0.2r=1/2or2/5*(r 75%)=1/22r/5 2/5*3/4=1/22r/5 3/10=1/22r=5(1/2-3/10)2r=5/2-15/102r=25/10-15/102r=10/10r=5/10r=1/2個人認為第2個解法有D麻煩...=.="

2007-05-18 22:14:10 補充:
其實可以再簡單D=.="2/5*(r+75%)=1/2r+75%=(1/2)/(2/5)r+3/4=1/2*5/2r+3/4=5/4r=5/4-3/4r=2/4r=1/2
參考: myself
2007-12-08 5:34 am
第一條第三行應該係
5s=8.3+0.2
吾係減
2007-05-20 6:14 am
1) 5s-20%=8.3
5s-0.2=8.3
5s=8.5
s=1.7

2)2/5(r+75%)=1/2
0.4(r+0.75)=0.5
0.4r+0.3=0.5
0.4r=0.2
r=0.5
參考: me
2007-05-19 6:09 am
1)
5s-20%=8.3
5s=8.3+20/100
5s=8.5
s=8.5/5
s=1.7

2)
2/5*(r+75%)=1/2
r+75%=1/2*5/2
r+75%=5/4
r=5/4-75%
r=1/2
2007-05-19 5:57 am
1) 5s-20%=8.3
5s-0.2=8.3
5s=8.5
s=1.7

2) 2/5(r+75%)=1/2
2/5(r+75%)=1/2
2/5r+3/10=1/2
10(2/5r+3/10)=1/2(10)
4r+3=5
4r=2
r=1/2
2007-05-19 5:49 am
1)
5s-20%=8.3
5s-0.2=8.3
5s=8.3+0.2
s=8.5/5
=1.7
2)
2/5 x (r+75%)=1/2
0.4 x (r+0.75)=0.5
r+0.75=0.5/0.4
r=1.25-0.75
=0.5
2007-05-19 5:48 am
1)5s-20%=8.3
5s=8.3+20%
5s=8.5
s=1.7
2) 2/5(r+75%)=1/2
0.4x(r+0.75)=0.5
(r+0.75)=0.5/0.4
r=1.25-0.75
r=0.5
2007-05-19 5:48 am
1)5s-20%=8.3
5s=8.3+20%
5s=8.5
s=1.7
2) 2/5乘(r+75%)=1/2
0.4x(r+0.75)=0.5
(r+0.75)=0.5/0.4
r=1.25-0.75
r=0.5
參考: me
2007-05-19 5:47 am
1)
5s-20%=8.3
5s=8.3+20/100
5s=8.5
s=8.5/5
s=1.7

2)
2/5*(r+75%)=1/2
r+75%=1/2*5/2
r+75%=5/4
r=5/4-75%
r=1/2
2007-05-19 5:45 am
1) 5s-20%=8.3
5s-0.2=8.3
5s=8.5
s=1.7
2) 2/5乘(r+75%)=1/2
2/5(r+75%)=1/2
2/5r+3/10=1/2
10(2/5r+3/10)=1/2(10)
4r+3=5
4r=2
r=1/2


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