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Ответы
Объяснение:
№1
а) (3х+5)+(8х+1)=17
3х+5+8х+1=17
11х+6=17
11х=17–6
11х=11
х=11÷11=1; х=1
б) 19–5(3х–1)=9
19–15х+5=9
–15х+24=9
–15х=9–24
–15х= –15
х= –15÷(–15)=1; х=1
в) (3–5,8х)–(2,2х+3)=16
3–5,8х–2,2х–3=16
–8х=16
х=16÷(–8)= –2; х= –2
г) 21= –20–8(2х–0,5)
21= –20–16х+4
21= –16х–16
16х= –16–21
16х= –37
х= –37/16; х= –37/16
№2
а) 30+5(3х–1)=35х–25
30+15х–5=35х–25
15х–35х+25= –25
–20х= –25–25
–20х= –50
х= –50÷(–20)=2,5;. х=2,5
б) 10х–5=6(8х+3)–5х
10х–5=48х+18–5х
10х–48х+5х=18+5
–33х=23
х= –23/33 х= –23/33
в) –10(3–4х)+51=7(5х+3)
–30+40х+51=35х+21
40х–35х=21+30–51
5х=0
х=0÷5=0; х=0
г) 6х–(3х+2)=5(х–1)–8
6х–3х–2=5х–5–8
3х–5х= –13+2
–2х= –11
х= –11÷(–2)=5,5; х=5,5
№3
а) 6(8х+5)=0
48х+30=0
48х= –30
х= –30/48= –5/8;. х= –5/8
б) 6(8х+5)= –6
48х+30= –6
48х= –6–30
48х= –36
х= –36/48= –3/4; х= –3/4
в) –8(2х–0,5)=0
–16х+4=0
–16х= –4
х= –4/–16=4/16=1/4;. х=1/16
г) –8(2х–0,5)= –8
–16х+4= –8
–16х= –8–4
–16х= –12 |×(–1)
16х=12
х=12/16=3/4; х=3/4