(5Х+12)(4,2-2Х)=0
21х-10²+50,4-24х=0
-10х-3х+50,4=0
10х+3х-50,4=0
Д=9+2016=45²
х1=-3+45÷20=2,1
з2=-3-45÷20=-2,4
ответ: 2,1; -2,4.
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(5Х+12)(4,2-2Х)=0
21х-10²+50,4-24х=0
-10х-3х+50,4=0
10х+3х-50,4=0
Д=9+2016=45²
х1=-3+45÷20=2,1
з2=-3-45÷20=-2,4
ответ: 2,1; -2,4.