1)\left \{ {{2c-d=2} \atop {3c-2d=3}} \right.

2)\left \{ {{\frac{1}{5}(x+y) =2} \atop {\frac{1}{2}(x-y) =1}} \right.

3)\left \{ {{0,3(x+y)=22,2} \atop {0,4(x-y)=6,4}} \right.

4)\left \{ {{x+y=1-2} \atop {x-y=3}} \right. =2x

5)\left \{ {{x+y=2} \atop {y+z=4}} \right. \\z+x=6

Эргаш2Исамов    3   01.10.2019 23:41    0