Решите 3 и 4

Question

Решите 3 и 4

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Answer 1

4) 3x1x2(x1+x2)/2x1x2=3(x1+x2)/2=-3/2*11/3=-5,5
3)-x+2-3x+3<2x  5<6x  x>5/6
5x+4>=12-x+3  6x>=11  x>=11/6
-411/6<=x<4<br>