Question

Află termenul necunoscut:
a - (6 x 7) = 48
(8 x 7) - a = 20
a + (8 : 1) = 24 (7 : 7) + a = 21
a - (10: 10) = 99
1219-a = 948
a-4 914 = 1 748
1219-a = 999
(6 x 6): a = 4
a:(4 : 1) = 7 ​

Answer 1

1. a-(6×7)=48

a-42=48

a=48+42

a=90

2. (8×7)-a=20

56-a=20

a=56-20

a=36

3. a+(8:1)=24

a+8=24

a=24-8

a=16

4. (7:7)+a=21

1+a=21

a=21-1

a=20

5. a-(10:10)=99

a-1=99

a=99+1

a=100

6. 1219-a=948

a=1219-948

a=271

7. a-4914 = 1 748

a=4019+1748

a=5767

8. 1219-a = 999

a=1219-999

a=220

9. (6x6):a = 4

36:a=4

a=36:4

a=9

10. a:(4:1) = 7

a:4=7

a=7×4

a=28