3道数学题,请各位帮忙,按初一的答,要详细过程!{2x+y=2~y=4x-1 ~~~~~~~~~~~~~~~~~~~~~~~~~~~{2x+3y=-9~3x-2y=19~~~~~~~~~~{x-3/2(2x-1)≤4~1+3x/2>2x-1

问题描述:

3道数学题,请各位帮忙,按初一的答,要详细过程!
{2x+y=2~y=4x-1 ~~~~~~~~~~~~~~~~~~~~~~~~~~~{2x+3y=-9~3x-2y=19~~~~~~~~~~{x-3/2(2x-1)≤4~1+3x/2>2x-1