Руслан6 лет назад
1 7/20 / 2,7 + 2,7 / 1,35 + (0,4 / 2 1/2)(4,2 - 1 3/40) = 3.
1 7/20 = (1 * 20 + 7)/20 = 27/20.
2,7 = 2 7/10 = (2 * 10 + 7)/10 = 27/10.
1,35 = 1 35/100 = (1 * 100 + 35)/100 = 135/100 сократим на 5 = 27/20.
0,4 = 4/10 на 2 = 2/5.
2 1/2 = (2 * 2 + 1)/2 = 5/2.
4,2 = 4 2/10 = (4 * 10 + 2)/10 = 42/10 на 2 = 21/5.
1 3/40 = (1 * 40 + 3)/40 = 43/40.
2 = 1 2/2 = (1 * 2 + 2)/2 = 4/2.
1. 2/5 / 5/2 = (2 * 2)/(5 * 5) = 4/25.
2. 21/5 - 43/40 = (168 - 43)/40 = 125/40 сократим на 5 = 25/8.
3. 27/20 / 27/10 = (27 * 10)/(20 * 27) = 270/540 на 270 = 1/2.
4. 27/10 / 27/20 = (27 * 20)/(10 * 27) = 540/270 = 2.
5. 4/25 * 25/8 = (4 * 25)/(25 * 8) = 100/200 на 100 = 1/2.
6. 1/2 + 4/2 + 1/2 = (1 + 4 + 1)/2 = 6/2 = 3.