Question

determina x e N astfel incat: a) 4x<6,4 b)5x<0,25 c)3,6x>18 d)01,7x<0,85 e) 0,25x<2 f)3,2x>8 g)5x-3,8<4,8x h) 1,3x<4(9+0,1x) i) 1,7+3( 1,2x+7)<22,7 j) 1,2x+1,3 (x+4) < 2,5 (x+5) k) 7+0,8 (2x+3)>1,6x +10 l) 3,4+1,2 (0,5x+1,6)< 0,2x +8. VA ROG ESTE URGENT

Answer 1

a)x<1,6 =>x∈{0,1}
b)x<0,05 =>x∈{0}
c)x>5 =>x∈{5,6,7,8,9,10...}
d)x<5 =>x∈{0,1,2,3,4}
e)x<8 =>x∈{0,1,2,3,4,5,6,7}
f)x>2,5 =>x∈{3,4,5,6,7,8,9,10...}
g)-3,8<-1,2x sau 3,8>1,2x =>x<3,1(6) =>x∈{0,1,2,3}
h)1,3x<36+0,4x sau 0,9x<36 =>x<40 =>x∈{0,1,2,...39}
i)1,7+3,6x+21<22,7 sau 3,6x+22,7<22,7 sau 3,6x<0 =>x<0 =>nu are solutii
j)1,2x+1,3x+5,2<2,5x+12,5 sau 2,5x+5,2<2,5x+12,5 =>ecuatie incompatibila
k)7+1,6x+2,4>1,6x+10 =>ecuatie incompatibila
l)3,4+0,6x+1,92<0,2x+8 sau 0,6x+5,32-0,2x-8<0 =>0,4x<2,68 =>x<6,7 =>x∈{0,1,2,3,4,5,6}