15 * 10 + (30 − 20) * 5; 15 * 10 + 30 − 20 * 5; (120 + 320 : 4) * 2; (120 + 320) : (4 * 2).

4 классМатематика

15 * 10 + (3020) * 5;
15 * 10 + 3020 * 5;
(120 + 320 : 4) * 2;
(120 + 320) : (4 * 2).

StaticConfig

15 * 10 + (30 − 20) * 5; 15 * 10 + 30 − 20 * 5; (120 + 320 : 4) * 2; (120 + 320) : (4 * 2).

Решение

$15 \overset{2}{*} 10 \overset{4}{+} (30 \overset{1}{-} 20) \overset{3}{*} 5 = 150 + 10 * 5 = 150 + 50 = 200$;
$15 \overset{1}{*} 10 \overset{3}{+} 30 \overset{4}{-} 20 \overset{2}{*} 5 = (120 + 80) * 2 = 200 * 2 = 400$;
$(120 \overset{2}{+} 320 \overset{1}{:} 4) \overset{3}{*} 2 = 150 + 30 - 100 = 180 - 100 = 80$;
$(120 \overset{1}{+} 320) \overset{3}{:} (4 \overset{2}{*} 2) = 440 : 8 = 55$.