Question

Tìm x, biết2+4+6+...+ 2× x=110Mong các bạn giúp-_-  ♡_♡

Answer 1

2 + 4 + 6 + ... +2 × x = 110

2 × (1 + 2 + 3 + .... + x) = 110

2 × (1 + x) × x : 2 = 110

(1 + x) × x = 11 × 10

=> x = 10

Vậy x = 10

Answer 2

2 + 4 + 6 + ... +2 × x = 110

2 × (1 + 2 + 3 + .... + x) = 110

2 × (1 + x) × x : 2 = 110

(1 + x) × x = 11 × 10

=> x = 10

Vậy x = 10