1) 239 * 72=17208
2)669*99=66231
3)17208+66231=83439
4)83439*100=8343900
5)8343900:10=834390
X+294=10.816-306
х+296=10.510
x=10.510- 294
х=10 216
10.216+294=10.816-306
10.510=10.510
В 1 ч - 60 мин
7/8 ч = 60/8*7 = 52 1/2 = 52,5 мин
7×5×9=7×45(315)
8×6×4=8×24(192)
3×5×9=15×9(135)
8×6×4=48×4(192)
-24.786|306
24 48 81
_____
-306
306
___
0
-12443|541
1082 23
____
-1623
1623
____
0