(5+4):2=9:2=4,5
(5+3):2=8:2=4
(5+5):2=10:2=5
(5+6):2=11:2=5,5
012345
102.103.104.105.
123.124.125.
120.130.140.150
201.203.204.205
210.230.240.250.
301.302.304.305
310.320.340.350
401.402.403.405.
410.420.430.450.
501.502.503.504
510.520.530.540.
213.214.215.231.234.235.241.243.245.
312.314.315.321.324.325.345
412.413.415.421.423.425.431.432.435.
512.513.514.521.523.524.531.532.534.541.542.543.
Хватит)))
S=50*t
S=(50+10)*(t-1)
50t=60t-60
10t=60
t=6 часов
<span>S=50*6=300 км</span>
Уравнение: (4+ ×)*2+2×=24
8+2×+2×=24
4×=16
×=4
4+×=8
далее просто,это мы узнал стороны, теперь площадь: 8 × 4= 32