)5 3 7 5 1 2 25A X X X X )3 7 5 1 3 2 13B X X X X HƯỚNG DẪN 2 2A X X X X X X )5 35 15 105 5 10 2 25 41X 107 25 41X 822X)3 15 21 105 3 3 2 13B X X X X X 5X 103 13 5X 9018X
Bài 4. Tìm x, biết :
)5 3 7 5 1 2 25a x x x x )3 7 5 1 3 2 13b x x x x Hướng dẫn2
2
a x x x x x x )5 35 15 105 5 10 2 25 41x 107 25 41x 822x)3 15 21 105 3 3 2 13b x x x x x 5x 103 13 5x 9018x