Răspunsuri

2014-08-30T15:55:25+03:00
A)2x +26  < 42

2x < 42-26

2x < 16  |:2

x < 8   =>  x={0,1,2,3,4,5,6,7}
x∈N

b)3x+ 63 < 64

3x < 64 -63

3x < 1 

x < 1/3  =>  x={0}
x∈N

c)3x-6 +29 =59

3x=59-29+6

3x=36 |:3

x=12

d)60-12x +31 =115

91 -12x =115

-12x = 115-91

-12x= 24 |:12

-x = 2

x= -2
x∈ N       =>x={Ф}
4 5 4