1. 2•(86:2)+98:4=110.5
1. 86 ÷ 2 = 43
2. 2 • 43 = 86
3. 98 ÷ 4 = 24,5
4. 86 + 24, 5 = 110.5
2. 100:50-400+393•2=388
1. 100 ÷ 50 = 2
2. 393 × 2 = 786
3. 786 - 400 = 386
4. 386 + 2 = 388
3.60•4+220:2•10-15=1325
60 * 4 = 240
220 ÷ 2 = 110
110 × 10 = 1100
240 + 1100 = 1340
1340 - 15 = 1325