Hiệu số phần bằng nhau là :
5-2=3(phần)
Tử số là :
45:3x2=30
Mẫu số là :
30+45=75
Vậy : Phân số đó có giá trị bằng 30/75
Gọi mẫu số là x
tử số là x+45
ta có :\(\frac{x+45}{x}=\frac{2}{5}\)
\(\Leftrightarrow\left(x+45\right).5=2x\)
\(\Leftrightarrow5x+225=2x\)
\(\Leftrightarrow3x=-225\)
\(\Leftrightarrow x=-75\)
=>tử số x+45=-75+45=-30
vậy phân số đó là \(\frac{-30}{-75}=\frac{30}{75}\)
Nhớ k mình đấy nhé ko k khỏi giúp lần sau đó :))
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