<span>1)334-286+166=334+166-286=214</span>
<span><span>2)518-135-265=518-(265+135)=118</span></span>
<span>3)20*399*50=50*20*399=399000</span>
<span><span>4)93*28-</span><span>28*53=(93-53)*28=1120</span></span>
1 пример = 64 2 пример =46 3 пример = 28