Question

rezolvati in multimea nr.nat.a)245×-31=2(112×+79)
b)(71×-18)×3mai mic sau egal cu 210×

Answer 1

a) 245X-31=2(112X+79)
    245X-31=224X+158
    245X-224X=158+31
    21X= 189
    X=189 ÷21
    X=9
b) (71X-18)×3≤210X
     213X-54≤210X
     213X-210X≤54
     3X≤54
     X≤54÷3
    X≤18
    X∈{0,1,2,3,4,......18}

Answer 2

245x=2(112x+79
245x=31-224x+158
245x-224x=158+31
21x=189
x=189:21
x=9



b) (71x-18)x3mai mare sau egal decat210x213x-210x Mai mare sau egal cu 543x Mai mare sau egal cu54
xmai mare sau egal cu54:3
xmai mare sau egal cu18
xmai mare sau egal cu10
x={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18