<span>240*710+7100*76 = 71 (2400+7600) = 71 * 10 000 = 710 000.
</span><span>
38*5800+380*520 = 38 (5800 + 5200) = 38* 11 000 = 38 * (10 000 + 1000) = 380 000 + 38 000 = 418 000.
</span>
1. 12/120 = 39/390
2. 72/8 = 54/6
3. 5/2.5 = 2/1
(Число/число -это дробь)
1)246
2)<span>520000
3)830000
4)436800
5)55170
6)1</span>
Х=100-16-8-12
х=54
х=54/1(х)