Tính:
9 x 8 x 15/ 6 x 4 x 15
K
Khách
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20 tháng 2 2022
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
20 tháng 2 2022
Gọi stn cần tìm là a ( \(a\in N\))
Ta có \(\frac{13-a}{35+a}=\frac{3}{5}\)
\(\Rightarrow5\left(13-a\right)=3\left(35+a\right)\)
\(65-5a=105+3a\)
\(65=105+8a\)
\(8a=65-105\)
\(8a=-40\)
\(\Rightarrow a=-5\)(KTM)
Nếu đầu bài là số nguyên thì a=-5 nha
Còn là stn thì không có giá trị nào thoả mãn.
HT
20 tháng 2 2022
Gọi stn cần tìm là a \(\left(a\in N\right)\)
Ta có : \(\frac{13+a}{35-a}=\frac{3}{5}\)
\(\Rightarrow5\left(13+a\right)=3\left(35-a\right)\)
\(65+5a=105-3a\)
\(65=105-8a\)
\(105-65=8a\)
\(40=8a\)
\(\Rightarrow a=5\)(TM)
Vậy stn cần tìm là a
HT
DL
25
\(\frac{9\times8\times15}{6\times4\times15}\)
\(=\frac{3\times3\times4\times2\times15}{3\times2\times4\times15}\)
\(=\frac{3}{1}\)
\(=3\)
= 10800