А) (х-1)*(х-3)*(х-5) = (х2-3х-х+3)*(х-5) = (х2-4х+3)*(х-5) = х3-5х2-4х2+20х+3х-15 = х3-9х2+23х-15.
319+х=502
х=502-319
х=183
10000-х=1096
х=10000-1096
х=8904
х*205=2255
х=2255:205
х=11
3417:х=17
х=3417:17
х=201
0.0464+х-0.8=0.168
-0,7536+х=0.168
х=0.168+0.7536
х=9216
1) 3000:5=600:3=200
2)3600:3=1200