3a.Find the L.C.M. of 3(x-1) and 2(x-1)
b.Simplify 8x+13/3(x-1) + 3(2x+3)/2(1-x) + x/2(x-1)
4. The price $P of gas supplied to households by a gas company is
calculated using the formula
P=15+8n
where n represent the number of units of gas consumed.
a.Mr Chan consumed 20 units of gas last month. What was the amount he had to pay for his gas conaumption?
b.Mr Chan has to pay $191 for the gas this month. What is his gas consumption this month?
maths(need the step!!!)
2008-02-17 12:37 am
回答 (2)
2008-02-17 1:10 am
✔ 最佳答案
L.C.M(3(x-1) and 2(x-1))=L.C.M(3 and 2)
so ans.=6(x-1)
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8x+13/3(x-1) + 3(2x+3)/2(1-x) + x/2(x-1)
=8x+13/3(x-1) - 3(2x+3)/2(x-1) + x/2(x-1)
=8x+13/3(x-1) -(5x+9)/2(x-1)
=2(8x+13)/6(x-1) -3(5x+9)/6(x-1)
=(16x+26-15x-27)/6(x-1)
=(x-1)/6(x-1)
=1/6
---------------------------------------------
p=15+8*20=175
--------------------------------
p=191, p=15+8n
191=15+8n
8n=176
n=22
-----------------------------------
ps: if you want to know how to do , you must try to do
2008-02-17 1:32 am
3a. 6(x-1)
b. 8x+13/3(x-1) + 3(2x+3)/2(1-x) + x/2(x-1)
= 8x+13/3(x-1) - 3(2x+3)/2(x-1) + x/2(x-1)
= (16x+26-18x-27+3x)/6(x-1)
= (x-1)/6(x-1)
= 1/6
4a.
2008-02-16 17:35:13 補充：
4a. P= 15+8(20)=15+160=$175b. 191= 15+8n191-15=8n176=8nn=176/8n=22
b. 8x+13/3(x-1) + 3(2x+3)/2(1-x) + x/2(x-1)
= 8x+13/3(x-1) - 3(2x+3)/2(x-1) + x/2(x-1)
= (16x+26-18x-27+3x)/6(x-1)
= (x-1)/6(x-1)
= 1/6
4a.
2008-02-16 17:35:13 補充：
4a. P= 15+8(20)=15+160=$175b. 191= 15+8n191-15=8n176=8nn=176/8n=22
參考: me
收錄日期: 2021-04-13 15:09:32
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