Ответы и объяснения

2014-01-15T19:26:36+04:00
1) х=5.5-7
    х=-1.5
 2) 9.5х+2=5.7х-5.6
    3.8х=-7.6
     х=-2
3)2.9х+7.4=х+1.7
   1.9х=-5.7
    х=-3
2014-01-15T19:30:06+04:00
2x+7=x+5.5
2x+7-x-5.5=0
x+1.5=0
x=-1.5



9.5x+2=5.7x-5.6
9.5x+2-5.7x+5.6=0
3.8x+7.6=0
3.8x=-7.6
x=-7.6/3.8=-2



2.9x+7.4=x+1.7
2.9x-x+7.4-1.7=0
1.9x+5.7=0
1.9x=-5.7
x=-5.7/1.9=-3