Упростите выражение (2-c)^2-c(c+4) найдите значение при c=0.5
4-4с+с^2-4c=0
-8c+4=0
c=1/2
4-4c+c^2-c^2-4c=4-8c
4-8*0.5=4-4=0
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4-4с+с^2-4c=0
-8c+4=0
c=1/2
4-4c+c^2-c^2-4c=4-8c
4-8*0.5=4-4=0