1,a)(-4)/9.7/9+17/9.(-1)/5-4/5.10/9 b)34/7.13+51/13.22+85/22.37+68/37.49 2,1) tìm x biết: a)(7x-11)³=2⁵.5²+200 b) x+19/2019+x+18/2018+x+17/2017+...+x+1/2001=19 2) tìm các cặp số nguyên(x;y) thoả mãn:xy-2y+x-3=0 3) tìm n€Z để biểu thức A=3n-2/n+1 là phân số tối giản

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