Mathematics, 23.07.2021 14:00 lover23707

cho f(x) = ax^2 + bx+c. a) tính f(1),f(3).b) biết 5a -b +2c=0. chứng minh f(1),f(2) bé hơn hoặc bằng 0. c) a=1, b=2,c=3.chứng minh f(x) không có nghiệm

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cho f(x) = ax^2 + bx+c. a) tính f(1),f(3).b) biết 5a -b +2c=0. chứng minh f(1),f(2) bé hơn hoặc bằng...

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