Cos(a+b)+sina*sinb = cosa*cosb - sina*sinb + sina*sinb = cosa*sinb = -2/5 * 15/16 = -3/8
Х-3/20=1/5
Х=1/5+3/20
Х=4/20+3/20
Х=7/20
4 3/20=83/20 ц =83/20*100=83*5=415 кг
415-105=310 кг осталось
<span>14(p-30)=630</span>
<span>14p-420=630</span>
<span>14p=1050</span>
<span>p=75</span>