4,8d+5,91+13,2d=150
18d=150-5.91
18d=144.09
d=144.09:18
d=8.005
<span>(2,61-4x):0,03+4,6=90
(2.61-4х):0.03=90-4.6
(2.61-4х):0.03=85.4
2.61-4х=85.4*0.03
2.61-4х=2.562
-4х=2.562-2.61
-4х=-0.048
х=-0.048:(-4)
х=0.012</span>
9-9=0
2-2=0
18-18=0
9+9=18
18-2=16
18-9=9
9+9=18
18+2=20
9+18=27
9+2=11
18:2=9
9 х 2=18
18 :9=2
2+2=4
9+9=18
18+18=36
9 :9=1
9-2=7
2:2=1
18:18=1
845:60 минут=14 (примерно)