Question

1)Afla nr necunoscut: 7x4-a=10 , a-4x9=93 , 8x4-a=15 , 7x4-a=60 , 7x3-a=3 , a-5x4=45 2) Completeaza factorii care lipsesc: 6x4=8x? , 4x4=2x? , 6x?=3x4 , 5x?=10x4 , 5x?=10x3 , ?x4=10x2 , 6x?=2x9 , 5x?=10x2

Answer 1

1. 7x4-a=10     
21-a=10
21-10
11

2. a-4x9=93
a-36=93
93-36
 57

3. 8x4-a=15
32-a=15
32-15
18

4. 7x4-a=60
28-a=60
60-28
32

5. 7x3-a=3
21-a=3
21-3
19 

6 a-5 x4=45
a-20=45
45-20
25 

2)5x8=4x10

5x6=10x3

5x4=10x2

6x3=2x9 

5x4=10x2