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分类:中学其它科目 | 用户: (46,890 分) 17 50 59
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(72024+72023)/7x=8         Find the value of x.

My working:

 (72024+72023) / 7= 8 

72024+72023 = 8(7x)

lg (72024+72023) = lg 8 + x lg 7

How do I continue?I am stuck at this "lg (72024+72023) "

* I know how to use google myself,or use some math solver tools online.But both of them can't solve such a question because 72024 exceed the format of x99(same as our scientific calculator).

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用户: (530 分) 2 3
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 This is my first answer after creating this account.  Please let me know if you can see the attached photo.  I hope this is not too late. 

用户: (46,890 分) 17 50 59
Thanks the answer is correct :)
Thanks for the working!
用户: (46,890 分) 17 50 59
whew I feel shameful to forgot about the basic law of indices......
用户: (530 分) 2 3
It is ok.  Always remember big number (in this case, the index) , it is very likely that we just need to simplify (finding common base or common factor). Don't really need to calculate because it is impossible to calculate ourselves (with calculators or working ourselves).
用户: (530 分) 2 3
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