6(n+5)=5[1-3(n-4)],到底要怎樣才可以找到你(不要直接告訴我答案)?

2017-10-11 10:43 pm
更新1:

‘你’打錯了,是n

回答 (1)

2017-10-12 6:44 am
Sol
6(n+5)=5[1-3(n-4)]
6(n+5)=5[1-(3n-12)]
6(n+5)=5(1-3n+12)
6(n+5)=5(13-3n)
6n+30=65-15n
6n+30+15n=65-15n+15n
21n+60=65
21n+60-60=65-60
21n=5
n=5/21


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