Пошаговое объяснение:
а) 42м²n/80m²n²= 21/40n
b) 5c/c²-4c= 5c/c × (c-4)= 5/c-4
c) 7x- 7y/x²-y²= 7(x-y)/(x-y)×(x+y)= 7/x+y
d) d²-36/d²-12d+36= (d-6)×(d+6)/(d-6)²= d+6/d-6
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Пошаговое объяснение:
а) 42м²n/80m²n²= 21/40n
b) 5c/c²-4c= 5c/c × (c-4)= 5/c-4
c) 7x- 7y/x²-y²= 7(x-y)/(x-y)×(x+y)= 7/x+y
d) d²-36/d²-12d+36= (d-6)×(d+6)/(d-6)²= d+6/d-6