50 – 33 = (40 + 10) – 33 = (40 – 33) + 10 = 7+10 = 17
50 – 35 = (40 + 10) – 35 = (40 – 35) + 10=5+10 = 15
50 – 19 = (20 + 30) – 19 = (20 – 19) +30= 1+30 = 31
50 – 24 = (30 + 20) – 24 = (30 – 24) + 10 = 6+20 = 26
50 – 12 = (20 + 30) – 12 = (20 – 12) + 30 = 8+30 = 38
<em />5ab+10a2=5a*(b+2a)
6x2-3x3-9x4=3x2*(2-x-3x2)
6c2x3-4c3x2+2c2x2=2c2x2*(3x-2c)
Уравнения: 2x2+4x=0 3x-5x2=0
x*(2x+4)=0 x*(3-5x)=0
x=0 2x+4=0 x=0 3-5x=0
2x=-4 3=5x
x=-2 x=3/5
12×3=36(км)
Ответ:расстояние-36км