а)(60 + 5)×7 = 65×7 = 45560 + 5×7 = 60 + 35 = 95(830 + 9)×5 = 839×5 = 4195830×5 + 952×1000 = 4150 + 952000 = 9561505200×10 = 52000
б)304×8 = 2432304×7 = 2128209×6 = 1254209×658 = 137822163 + 254 = 41758164 + 253 = 5841740000 - 3 = 3999739999 - 210 = 397891050: 10 = 105
а)
(60 + 5)×7 = 65×7 = 455
60 + 5×7 = 60 + 35 = 95
(830 + 9)×5 = 839×5 = 4195
830×5 + 952×1000 = 4150 + 952000 = 956150
5200×10 = 52000
б)
304×8 = 2432
304×7 = 2128
209×6 = 1254
209×658 = 137822
163 + 254 = 417
58164 + 253 = 58417
40000 - 3 = 39997
39999 - 210 = 39789
1050: 10 = 105