Question

what is the answer of it ?
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Answer 1

Step-by-step explanation:

the given equation can be written as

m/n - n/m = 7/5

now squaring both sides

we have

m²/n² + n²/m² - 2* m/n * n/m = 49/25

so m²/n² + n²/m² = 49/25 + 2

therefore

m²n^-2 + n²m^-2 = 99/25

Answer 2

the given picture is the process

and the answer is 49/25