1.2c/3(a-b)-3c/a-b 2.n/18(m+n)+3n/24(m+n)

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