Ответы и объяснения

2014-01-22T08:48:07+00:00
1)0.02х2+0.005х=0
    Х(0.02х+0.005)=0
     х=0              0.02х=-0.005
                         х=0.25
2)х2/3=х/6
   3х=6х2
    3х-6х2=0
    х(3-6х)=0
х=0                    3-6х=0
                          6х=3
                          х=0.5
3)-0.001=-0.004х2
х2=0.25
х=0.5

4)25(х-1)=5(х2-5)
   25х-25=5х2-25
   25-5х2=0
   5х(5х-1)=0
   5х=0
   х=0                                5х=1
                                        х=1/5