X+ +X+ +X+ = X+ +X+ B, A, 1 1 1 1 110 11 12 13 14− + − + − + − = −315 313 311 309X X X X101 103 105 107 4HD
Bài 7, Tìm x, biết: x+ +x+ +x+ = x+ +x+ b, a, 1 1 1 1 110 11 12 13 14− + − + − + − = −315 313 311 309x x x x101 103 105 107 4HD: = + + + − − = = + = = = −a,