1. 64*35 + 106*402 - 128/64 = 44850
64 * 35 = 2240
106 * 402 = 42612
128 : 64 = 2
2240 + 42612 - 2 = 44850
2. (8000 - 3988) * 105 - 945/5 * 100 = 402360
8000 - 3988 = 4012
4012 * 105 = 421260
945 : 5 = 189
189 * 100 = 18900
421260 - 18900 = 402360
3. 46839 - (322060 - 64 * 150) : 20 = 31216
64 * 150 = 9600
322060 - 9600 = 312460
312460 : 20 = 15623
46839 - 15623 = 31216
4 2/5+9 3/7=22/5+66/7=154/35+330/35=484/35=13 29/35
1/4 + 0,3 = 1/4 + 3/10 = 5/20 + 6/20 = 11/20 = 0,55