(20cdot 40-240):7 270:90cdot 13+54 (6cdot 8+22)cdot 5

Let's solve each expression step by step:<br /><br />1. \((20 \cdot 40 - 240) : 7\)<br /><br />First, calculate the multiplication:<br />\[ 20 \cdot 40 = 800 \]<br /><br />Then, subtract 240 from the result:<br />\[ 800 - 240 = 560 \]<br /><br />Finally, divide by 7:<br />\[ 560 : 7 = 80 \]<br /><br />So, the answer is \(80\).<br /><br />2. \(270 : 90 \cdot 13 + 54\)<br /><br />First, perform the division:<br />\[ 270 : 90 = 3 \]<br /><br />Then, multiply the result by 13:<br />\[ 3 \cdot 13 = 39 \]<br /><br />Finally, add 54 to the result:<br />\[ 39 + 54 = 93 \]<br /><br />So, the answer is \(93\).<br /><br />3. \((6 \cdot 8 + 22) \cdot 5\)<br /><br />First, calculate the multiplication:<br />\[ 6 \cdot 8 = 48 \]<br /><br />Then, add 22 to the result:<br />\[ 48 + 22 = 70 \]<br /><br />Finally, multiply by 5:<br />\[ 70 \cdot 5 = 350 \]<br /><br />So, the answer is \(350\).