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2022-09-03 20:52:42
2022-09-02 14:40:43
\(125-x^3-1\)
\(=124-x^3\)
2022-09-02 14:38:01
2022-09-02 14:36:05
x(x-y)+y(x+y)
=x2-xy+xy+y2
=x2+y2
Thay x=8; y=9 vào biểu thức trên ta được:
x2+y2
=82+92
=64+81
=145
2022-09-01 22:14:17
2022-09-01 22:13:21
2022-09-01 21:49:57
2022-09-01 21:47:22
Cái này mới đúng
9600065
2022-09-01 21:46:42
960065
2022-09-01 21:45:20
\(\dfrac{3}{5}+\dfrac{6}{11}+\dfrac{7}{13}+\dfrac{2}{5}+\dfrac{16}{11}+\dfrac{19}{13}=\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{6}{11}+\dfrac{16}{11}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)=1+2+2=5\)