1) <span>x+(619 - 392) = 719 +320
x + 227 = 1039
x = 1039 - 227
x = 812
2) 120 + 880 - x = 56 * 50
1000 - x = 2800
x = 1000 - 2800
x = -1800
3) x* ( 94 - 78 ) = 893 + 707
16x = 1600
x = 100
4) 5 * 25 : x = 890 - 865</span>
125 : x = 25
x = 125 : 25
<span> x = 5
</span>
270:y-2=840/3
270:y-2=280
Y=270/282
Y=45/47
Надеюсь понятно^_^
1) 90 * 3 = 270
2) 350/50=7
3) 7*6=42
4) 270-42= 228
1) 149 000 000 ÷ 29,2 × 100 = 510273972.6
Округляем до 510273973