Question

Afla nr necunoscut. (7×5)-d=50-10×4. (4×....)-(...×...)=32. (9×...)-(8×...)=. (...×...)+(...×3)=55. ...-...×6=24.

Answer 1

( 7 x 5) - d = 50 - 10 x 4
       35 - d  =50 - 40
       35 - d = 10
         d = 35 - 10
         d = 25

4 x 10 - 2 x 4 = 40 - 8 = 32

9 x 7 - 8 x 1 = 4 x 7 + 9 x 3 = 55
        63 - 8   = 28 + 27 
             55    = 55

48 - 4 x 6 = 48 - 24 = 24
72 - 8 x 6 = 72 - 48 = 24