1)4*8=32
2)13+32=45
3)27:3=9
4)0*6=0
5)9-0=9
6)45:5=9
7)9-9=0
84-6 =78 (м) - длина прямоугольника
X-8/15x=4,2,
7/15x=21/5,
x=21/5:7/15,
x=21*15/5*7,
x=9.
1)385,6см=3,856м
2)20,3кв.дм=0,203кв.метров
3)8,2ч<494 мин
4/5 * 3/7 = 12/35
3 * 2/5 = 6/5 = 1 1/5
5/9 * 3 2/5 = 5/9 * 17/5 = 17/9 = 1 8/9
5/9 * 3/10 = 1/6
3/8 * 1 5/9 = 3/8 * 14/9 = 14/24 = 7/12