TL

1/5 + 7/9 = 9/45 + 35/45 = 44/45

HT nha

T giúp mik

Tổng ban đầu của 2 phân số là:

        7/9 - 1/5 = 26/45

                    Đ/S: 26/45

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13/35=1/5+1/7+1/35           17/63=1/7+1/9+1/63

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286 phút

+99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 Phút đấy bn ạ !

các số tiếp là 25, 36, 49, 64...

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

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

That is a bicycle

Diện tích đất hthang là:

  \(\frac{1}{2}\) x ( 18,5 + 16,3 ) x 20,5 = 356,7 (m² )

Diện tích cái giếng hình tròn là:

   2 x 2 x 3,14 = 12,56 ( m² )

Diện tích còn lại là:

   356,7 - 12,56 = 344,14 ( m²)

    Đ/s: 344,14 m²

còn x là nhân ngũ nó sẻ ra sao

40 phần 6 nha