-20:(-5+3)=10
1) -5+3=-2
2)-20:-2=10
ответ:10
P = 2A + 2B
..........................
A = 2B
P = 2*2B + 2B = 4B + 2B = 6B
54 = 6B --> B = 9 (cm)
A = 2*9 = 18 (cm)
.............................
S= A*B = 18 * 9 = 162 (cm^2) - Ответ
24:6=60:15
9,5:1,9=8,5:1,7
18,4:2,3=11,2:1,4