а) 5:3 = 5/3б) 4:9 = 4/9в) 16:4 = 16/4 = 4г) 3:6 = 3/6 = 1/2
4 - (41/84 - 5/21) + 7 3/4 = 4 - (41/84 - 20/84) + 7 3/4= 4 - 21/84 + 7 3/4 = 4 - 1/4 + 7 3/4 = 4 + 7 = 11
5/7 ÷ 10/21 = 5/7 * 21/10 = 105/70 = 3/2
Уравнение 1: 8/9x = 2/9x = (2/9)/(8/9) = 2/8 = 1/4
Уравнение 2: x ÷ 9/16 = 32/45x = (32/45)*(9/16) = 288/720 = 4/10 = 2/5
Уравнение 3: x ÷ 5/6 = 12/13x = (12/13)/(5/6) = 72/65
а) 5:3 = 5/3
б) 4:9 = 4/9
в) 16:4 = 16/4 = 4
г) 3:6 = 3/6 = 1/2
4 - (41/84 - 5/21) + 7 3/4 = 4 - (41/84 - 20/84) + 7 3/4
= 4 - 21/84 + 7 3/4 = 4 - 1/4 + 7 3/4 = 4 + 7 = 11
5/7 ÷ 10/21 = 5/7 * 21/10 = 105/70 = 3/2
Уравнение 1: 8/9x = 2/9
x = (2/9)/(8/9) = 2/8 = 1/4
Уравнение 2: x ÷ 9/16 = 32/45
x = (32/45)*(9/16) = 288/720 = 4/10 = 2/5
Уравнение 3: x ÷ 5/6 = 12/13
x = (12/13)/(5/6) = 72/65