$10)A\\(-5)^2.(-5)^2\\=25.25\\=(25)^2\\11)A\\\sqrt{49}=7(\text{bạn lm sai nha }-\sqrt{49}\text{ ms bằng }-7)\\12)C\\\sqrt x=2\\\to(\sqrt x)^2=2^2\\\to x=4\\\to x^2=16\\13)D\\\text{ta có : x và y tỉ lệ thuận vs nhau }\\\to(-5).1=1.?\\\to?=-5\\14)B\\f(-1)=(-1)^2+1\\=1+1\\=2\\15)C\\\Delta{ABC}=\Delta{DEF}\\\to\Delta{CAB}=\Delta{FDE}$
