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rezolvati in r inecuatia ajutatima varog
a) 4(1-x mai mare sau egal 2x+3
b)-2x+7>8x-(x+2) 



Răspuns :

[tex]a)4(1-x)\geq2x+3\\ 4-4x\geq2x+3\\ -4x-2x\geq3-4\\ -6x\geq-1|\cdot (-1)\\ 6x\leq1\\ x\leq \frac{1}{6} \\ x\in(-\infty;\frac{1}{6}]\\ b)-2x+7>8x-(x+2)\\ -2x+7>8x-x-2\\ -2x-8x+x>-2-7\\ -9x>-9|\cdot (-1)\\ 9x<9\\ x<1\\ x\in(-\infty;1)[/tex]