a) 5×(182+20) = 5×182 + 5×20 = 910 + 100 = 1010б) 348×57 + 348×43 = 348×(57+43) = 348×100 = 34800в) 794×74 - 694×74 = (794-694)×74 = 100×74 = 7400
а) (7-x)×6 = 7×6 - x×6 = 42 - 6xб) 9×(y+4) = 9×y + 9×4 = 9y + 36в) (5z+4t)×8 = 5z×8 + 4t×8 = 40z + 32t
a) 5×(182+20) = 5×182 + 5×20 = 910 + 100 = 1010
б) 348×57 + 348×43 = 348×(57+43) = 348×100 = 34800
в) 794×74 - 694×74 = (794-694)×74 = 100×74 = 7400
а) (7-x)×6 = 7×6 - x×6 = 42 - 6x
б) 9×(y+4) = 9×y + 9×4 = 9y + 36
в) (5z+4t)×8 = 5z×8 + 4t×8 = 40z + 32t