Ответ:
(2х-5)²-4х²=0
4х²-20х+25-4х²=0
-20х+25=0
-20х=-25
х=0.8
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Ответ:
(2х-5)²-4х²=0
4х²-20х+25-4х²=0
-20х+25=0
-20х=-25
х=0.8