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fahrenheit : 9/5 × 25 + 32 = 77 f
reamur : 4/5 × 25 = 20
=25+273
=298K
°R= 4/5 x C
= 4/5 x 25
= 20°R
°F= 9/5C + 32
= 9/5 x 25 + 32
= 45 + 32
= 77°F