Question

cho x₁+x₂+x₃+....+x₄₉+x₅₀+x₅₁=0 va x₁+x₂=x₃+x₄=.....=x₄₇+x₄₈=x₄₉+x₅₀=x₅₀+x₅₁=1

Answer 1

Ta có : x1 + x2 + x3 + x4 + .......... +x49 + x50 + x51 = 0

<=> (x1 + x2) + (x3 + x4) + .......... + (x49 + x50) + x51 = 0

<=> 1 x 25 + x51 = 0

=> x51 = 0 - 25

=> x51 = -25 

Answer 2

19 dây nhà đúng 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 %