-6(х+2)=4х-17
-6х-12=4х-17
-6х-4х=-17+12
10х=5
х=5/10=1/2=0,5
(19х + 62):15 = 13
19х + 62 = 13*15
19х + 62 = 195
19х = 195-62
19х = 133
Х = 133:19
Х = 7
--------
(19*7 +62):15 = 13
(133+62):15 = 13
195:15 = 13
13 = 13
P=(a+b)•2=(4+6)•2=20 см
S=a•b=4•6=24 см
P=(a+b)•2=(1+2)•2=6 см
S=a•b=1•2=2 см
2,85*0.5+4.6*0.5-3.05*0.5=1.425+2.3-1,525=2.2