4х²+12х+9-х<span>²-4х-4+5=0
3х</span><span>²+8х=0
х(3х+8)=0
х=0 3х=-8
х=-2 1/3
Ответ: 0 и -2 1/3 </span>
zaqruzi photomath i vsyo ok
1) 4/57 : 1 2/19 = 4/57 : 21/19 = 4/57 * 19/21 = 4/63
2) 4/63 * 19/64 = 19/1008
6-6+6666:66×6-6=600
ну, как-то так )))