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y8914bersheda
@y8914bersheda
April 2021
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ПРОШУ ПОМОГИТЕ!!! ЗАРАНЕЕ СПАСИБКИ!!!
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altowa1
А) (8х-1)(2х-3) - (4х-1)² =38
16х²-24х-2х+3-16х²+8х-1=38 ⇒ -18х=36 ⇒ х= 36/-18= -2
б)
(15х-1)(1+15х)
=
8
3 3
3(225х²-1) =8*3
675х²-3=24 ⇒ 675х²=24+3=27 ⇒ х²= 27/675 ⇒ х²= 1/25
х=1/5
в) 0,5у³-0,5у(у+1)(у-3)=7
0,5у³ -0,5у³+1,5у²-0,5у²+1,5у= 7
у²+1,5у-7=0
Д= 2,25 -4*1*(-7)= 2,25+28=30,25 = 5,5²
у1= (1,5+5,5)/2*1=7/2=3,5 у2=(1,5-5,5)/2=-4/2=-2
г)
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Answers & Comments
16х²-24х-2х+3-16х²+8х-1=38 ⇒ -18х=36 ⇒ х= 36/-18= -2
б) (15х-1)(1+15х) = 8
3 3
3(225х²-1) =8*3
675х²-3=24 ⇒ 675х²=24+3=27 ⇒ х²= 27/675 ⇒ х²= 1/25
х=1/5
в) 0,5у³-0,5у(у+1)(у-3)=7
0,5у³ -0,5у³+1,5у²-0,5у²+1,5у= 7
у²+1,5у-7=0
Д= 2,25 -4*1*(-7)= 2,25+28=30,25 = 5,5²
у1= (1,5+5,5)/2*1=7/2=3,5 у2=(1,5-5,5)/2=-4/2=-2
г)