4а * 5. m * (-3) * (-5)
8b * (-3) n * 7 * (-2)
(-5) * 2. (-r) * 5 * (-3)
4x * (-3)
9y * (-5)
-7m * (-8)

ДАНО
Y = x³/(x³+1)

8кг=2л |×5
40кг=10л
ответ : 10л

1) 844:4=211
2)682:2=341
3) 999:3=333
4) 550:5=110
5) 286:2=143
6) 693:3=231
7) 408:4=102
8) 707:7=101

3 5/8 + 1 2/3 = 29/8 + 5/3 = (29 × 3 + 5 × 8)/24 = 87/24 + 40/24 = 127/24 = 5 7/24
4 4/9 - 2 5/6 = 40/9 - 17/6 = (40 × 2 - 17 × 3)/18 = 80/18 - 51/18 = 29/18 = 1 11/18
6 712 + (5 340 - 4 815)= 7 43/84
1) 5 3/40 - 4 8/15 = 203/40 - 68/15 = (203 × 3 - 68 × 8)/120 = 609120 - 544/120 = 65/120 = 13/24
2) 6 7/12 + 13/14 = 79/12 + 13/14 = (79 × 7 + 13 × 6)/84 = 553/84 + 78/84 = 631/84 = 7 43/84