共50条信息
已知\(x\)、\(y\)满足\(\begin{cases} & 2x+y=66 \\ & x+2y=-60 \end{cases}\),则\(x^{2}-y^{2}\)的值为______.
已知:\(3^{1=}3\),\(3^{2}=9\),\(3^{3}=27\),\(3^{4}=81\),\(3^{5}=243\),\(3^{6}=729…\),设\(A=2(3+1)(3^{2+}1)(3^{8}+1) +1\),则\(A\)的个位数字是
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