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2 years ago

11

cho phương trình 2x^2-5x-9 có hai nghiệm là x1,x2. không giải phương trình, hãy tính giá trị của biểu thức A= x1^2+x2^2-2x1x2^2

-2x1^2x2

1 answer:

irga5000 [103]2 years ago

8 0

Step-by-step explanation:

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https://youtu.be/f_kgUUaMZlw

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