1)685=857=1542
2)980:995=0,98
3)1542:1=1542
4)0,98+1542=1542,98
1)4x2-25=75
4x2=100
x2=25
x=5
2)2x-18=49
2x=67
x=33.5
3) 6x-14=121
6x=135
x=22.5
4)x=-3
780:(x-4)+25=90
780:(x-4)=65
x-4=780:65
x-4=12
x=12+4
x=16
52-(3y+4+y+3y):37=50
(3y+4+y+3y):37=52-50
<span>3y+4+y+3y=37*2
</span>7y+4=74
7y=70
y=10
<span>8 18 28 (+10) 38 (+10) 48 (+10) 58</span>