a) 48-(70:2+13)
1. 70:2=35
2. 35+13=48
3. 48-48=0
<span>б) 420+80:5*2</span>
<span>1. 80:5=16</span>
<span>2. 16*2=32</span>
<span>3. 420+32=452</span>
<span>в) <span>12*(32-28):2</span></span>
<span><span>1. 32-28=4</span></span>
<span><span>2.12*4=48</span></span>
<span><span>3. 48:2=24</span></span>
<span><span>г) <span> (2600 - 1000):4-392</span></span></span>
<span><span><span>1. 2600-1000=1600</span></span></span>
<span><span><span>2. 1600:4=400</span></span></span>
<span><span><span>3. 400-392=8</span></span></span>