Question

Calculeaza 3x+7x-8x,stiind ca :

a) X=12 b) X=5 c) X=100

Answer 1

a) 3x12+7x12-8x12=36+84-96=24

b) 3x5+7x5-8x5=15+35-40=10

C). 3x100+7x100-8x100=300+700-800=200

Answer 2

a.
3x12+7x12-8x12=36+84-96=120-96=24

b. 3x5+7x5-8x5=15+35-40=50-40=10

c. 3x100+7x100-8x100=300-700+800=1000-800=200