Question

8. Află numărul necunoscut:
25:5+ a x 2 = 25
b x 4 + 40 :5 = 16
24-CX3 - 15:3 = 10
d: 4 + 35 : 5 + 4 = 21​

Answer 1

Răspuns:

5+a·2=25:25

5+a·2=1

a·2=5-1

a·2=4

a=4:2

a=2

Answer 2

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! :)