1)x- suprafata cultivata
1/2 din x= 1/2 *x= x/2 -in prima zi
x-x/2= (2x-x)/2= x/2 -restul
1/3 din x/2= 1/3 *x/2= x/6 -in a doua zi
x/2-x/6= (3x-x)/6= 2x/6 -noul rest
1/4 din 2x/6= 1/4 *2x/6= 1/4 *x/3= x/12 -in a treia zi
2x/6 -x/12= (4x-x)/12= 3x/12 -noul nou rest
3x/12=10
x/4=10
x=4*40
x=40 ha
2)a)x-8/3=1/24 aducem la acelasi numitor
24x-64=1
24x=1+64
24x=65
x=65/24
b)3 intregi x/3 -7/3 =1 intreg 1/3
(9+x)/3 -7/3= 4/3
9+x-7=4
x+2=4
x=4-2
x=2