<span> 69-54:3+6=45</span>
<span></span>
69-(54:3+6)=45
(54:3+6)=18+6=24
69-24=45
69 -(54 : 3+ 6) = 45
1) 54 : 3 = 18
2) 18+ 6 = 24
3) 69- 24 = 45
<span>1) 9+11=20г</span>
<span>2) 340:20=17</span>