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№ 4
3<a+b<8; 2<ab<15; 7<3a+b<18
№ 5
![3x(x-3)-(3x+1)(x+4) textgreater 2-2(11x+3) \
3 x^{2} -9x-3 x^{2} -x-12x-4 textgreater 2-22x-6 \
-22x-4 textgreater -22x-4 3x(x-3)-(3x+1)(x+4) textgreater 2-2(11x+3) \
3 x^{2} -9x-3 x^{2} -x-12x-4 textgreater 2-22x-6 \
-22x-4 textgreater -22x-4](https://tex.z-dn.net/?f=3x%28x-3%29-%283x%2B1%29%28x%2B4%29+textgreater++2-2%2811x%2B3%29+%5C+%0A3+x%5E%7B2%7D+-9x-3+x%5E%7B2%7D+-x-12x-4+textgreater++2-22x-6+%5C+%0A-22x-4+textgreater++-22x-4)
не имеет решений.
№ 6
![left { {{ frac{5x-4}{6}-1 textgreater frac{2x+1}{3} } atop { {{ frac{3x+1}{4}-2x textgreater 2,5- frac{3x-2}{8} }} right. \
left { {{5x-4-6 textgreater 4x+2} atop {6x+2-16x textgreater 20-3x+2}} right. \
left { {{5x-10 textgreater 4x+2} atop {2-10x textgreater 22-3x}} right. \
left { {{5x-4x textgreater 10+2} atop {3x-10x textgreater 22-2}} right. \
left { {{x textgreater 12} atop {-7x textgreater 20}} right. \
left { {{x textgreater 12} atop {x textless -2 frac{6}{7} }} right. \ left { {{ frac{5x-4}{6}-1 textgreater frac{2x+1}{3} } atop { {{ frac{3x+1}{4}-2x textgreater 2,5- frac{3x-2}{8} }} right. \
left { {{5x-4-6 textgreater 4x+2} atop {6x+2-16x textgreater 20-3x+2}} right. \
left { {{5x-10 textgreater 4x+2} atop {2-10x textgreater 22-3x}} right. \
left { {{5x-4x textgreater 10+2} atop {3x-10x textgreater 22-2}} right. \
left { {{x textgreater 12} atop {-7x textgreater 20}} right. \
left { {{x textgreater 12} atop {x textless -2 frac{6}{7} }} right. \](https://tex.z-dn.net/?f=+left+%7B+%7B%7B+frac%7B5x-4%7D%7B6%7D-1+textgreater+++frac%7B2x%2B1%7D%7B3%7D++%7D+atop+%7B+%7B%7B+frac%7B3x%2B1%7D%7B4%7D-2x+textgreater++2%2C5-+frac%7B3x-2%7D%7B8%7D++%7D%7D+right.++%5C+%0A+left+%7B+%7B%7B5x-4-6+textgreater++4x%2B2%7D+atop+%7B6x%2B2-16x+textgreater++20-3x%2B2%7D%7D+right.++%5C+%0A+left+%7B+%7B%7B5x-10+textgreater++4x%2B2%7D+atop+%7B2-10x+textgreater++22-3x%7D%7D+right.++%5C+%0A+left+%7B+%7B%7B5x-4x+textgreater++10%2B2%7D+atop+%7B3x-10x+textgreater++22-2%7D%7D+right.++%5C+%0A+left+%7B+%7B%7Bx+textgreater++12%7D+atop+%7B-7x+textgreater++20%7D%7D+right.++%5C+%0A+left+%7B+%7B%7Bx+textgreater++12%7D+atop+%7Bx+textless++-2+frac%7B6%7D%7B7%7D+%7D%7D+right.++%5C+)
Система не имеет решений
3<a+b<8; 2<ab<15; 7<3a+b<18
№ 5
не имеет решений.
№ 6
Система не имеет решений
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