1)4х+х=20
2х=20_4
х=8 в 2 кош
8+4=12 груш в 1 кош
-1/2 * (-2/3) * (-3/4) * (-4/5) = 1/3
1) -1/2 * (-2/3) = 2/6 = 1/3
2) (-3/4) * (-4/5) = 12/20 = 3/5
3) 1/3 * 3/5 = 3/15 = 1/3
Y +5/7=2 4/9: 1/3
y + 5/7=22/9 : 1/3
y + 5/7=22/9 * 3/1
y + 5/7=7 1/3
y= 7 1/3 - 5/7
y=6 24/21 - 15/21
y=6 3/7
<span>(4,5-x)*5,8=8,7
</span>
<span>4,5-x=8,7/5,8
</span><span>4,5-x</span>=1,5
x=4,5-1,5
x=3