Răspuns :
a) 25÷5+a×2= 25
5+2a= 25 | - 5
2a= 20 | ÷ 10
a=10
b) b×4+40÷5= 16
4b+8= 16 | - 8
4b= 8 | ÷ 4
b=2
c) 24-c×3-15÷3= 10
24-3c-5= 10 | - 10
24-3c-5-10= 0 | + 3c
24-5-10= 3c
19-10= 9 = 3c | ÷3
c=3
d) d÷4+35÷5+4= 21 | - 4
d÷4+7= 17 | - 7
d÷4= 10 | × 4
d=40
Sper ca te-am ajutat! :)