25+4 c 2/25-4 c 2+2 c/5+2c упростить выражение. решите пожалуста
1)5/2с-5 2)5/5+2с 3)5/5-2с 4)-(5/+2с) и 5)30/25-4с2
1)5/2с-5 2)5/5+2с 3)5/5-2с 4)-(5/+2с) и 5)30/25-4с2
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25-4c² 5+2c (5-2c)(5+2c) 5+2c (5-2c)(5+2c)
=25+4c²+10c-4c² = 25+10c = 5(5+2c) = 5
(5-2c)(5+2c) (5-2c)(5+2c) (5-2c)(5+2c) 5-2c
Ответ: 3)