Question

37×49+31×51+63×49+51×63 помогите пожалуйста

Answer 1

37 × 49 + 31 × 51 + 63 × 49 + 51 × 63 =

1) 37 × 49 = 1813
2) 31 × 51 = 1581
3) 63 × 49 = 3087
4) 51 × 63 = 3213
5) 1813 + 1581 = 3394
6) 3087 + 3213 = 6300
7) 3394 + 6300 = 9694