Question

Calculați!
3[2(2x-5)-15]-12 < sau egal cu 9
x aparține Z
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Answer 1

3[2(2x-5)-15]-12≤9. X aparține lui Z 3[2(2x-5)-15]≤9+12 [2(2x-5)-15]≤21:3 2(2x-5)≤7+15 2x-5≤22:2 2x≤11+5 X≤16:2 x≤8 X€{8,7,6,5,4,3,2,1,0,-1,-2,-3,-4,-5,-6,-7,-8......}