4 5 (- 3х 7 )=- 9 July 8, 2019 16 32 64 128 3х 7 4 5 9х 2 4 3х 6 9х 7 7х 5 9х 5 x 7 = 35 4 3 - ( х + 5 7) 4х-5 7 3 9+х