The value of a is 4 times that of b .If their sum is 45,find the value of a .
我要一條式，最好講埋解釋！！！！！
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一條數學題（中一）～２０點～快Ｄ黎啦
2006-11-26 10:12 pm
回答 (6)
2006-11-26 10:18 pm
✔ 最佳答案
a=4ba+b=45
4b+b=45
5b=45
b=9
a=9X4=36
2006-11-26 10:22 pm
Let the value be A
: A * 4 = b
A + b = 45
A + (A * 4) = 45
A * 5 = 45
A = 45 / 5 = 9
So the value A is 9
: A * 4 = b
A + b = 45
A + (A * 4) = 45
A * 5 = 45
A = 45 / 5 = 9
So the value A is 9
參考: 自~
2006-11-26 10:19 pm
1) a=4b
2) a+b=45
a=45-b
Find b:
45-b=4b
5b=45
b=9
Find a:
a=4b
a=4*9
a=36
2) a+b=45
a=45-b
Find b:
45-b=4b
5b=45
b=9
Find a:
a=4b
a=4*9
a=36
參考: Witherhill
2006-11-26 10:16 pm
Let the value be A
Step 1: A * 4 = b
Step 2: A + b = 45
Step 3: A + (A * 4) = 45
Step 4: A * 5 = 45
Step 5: A = 45 / 5 = 9
So the value A is 9
Step 1: A * 4 = b
Step 2: A + b = 45
Step 3: A + (A * 4) = 45
Step 4: A * 5 = 45
Step 5: A = 45 / 5 = 9
So the value A is 9
2006-11-26 10:15 pm
A=4b=45
收錄日期: 2021-04-13 13:22:30
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