Докажите тождество: 5-(5-(5-(5-x)))=x x-(x-(x-(x-5)))=5

Question

Докажите тождество: 5-(5-(5-(5-x)))=x x-(x-(x-(x-5)))=5

Answer 1

5-(5-(5-5+х)=5-(5-5+5-х)=5-5+5-5+х= х

Х-(х-(х-х+5)=х-(х-х+х-5)=х-х+х-х+5=5

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