Помогите решить пжлст А) 4-6*(х+)=3-5х Б)(5х+8)-(8х+14)=9 В)2,7+у=9*(у-2,1)...

Question

Помогите решить пжлст
А) 4-6*(х+)=3-5х
Б)(5х+8)-(8х+14)=9
В)2,7+у=9*(у-2,1)
Г)0,3*(8-3у)=3,2-0,8*(у-7)
Д)5/6*(1/3х-1/5)=3х+3 1/3

Answer 1

А) 4-6*(х+2)=3-5х
4-6х-12=3-5х
-6х+5х=3-4+12
-х=11
х=-11

Б)(5х+8)-(8х+14)=9
5х+8-8х-14=9
5х-8х=9-8+14
-3х=15
х=15:(-3)
х=-5

В)2,7+у=9*(у-2,1)
2.7+у=9у-18.9
у-9у=-18.9-2.7
-8у=-21.6
у=-21.6:(-8)
у=2.7

Г)0,3*(8-3у)=3,2-0,8*(у-7)
2.4-0.9у=3.2-0.8у+5.6
-0.9у+0.8у=3.2+5.6-2.4
-0.1у=6.4
у=6.4:(-0.1)
у=-64

Д)5/6*(1/3х-1/5)=3х+3 1/3
5\18х-1\6=3х+10\3
5\18х-3х=10\3+1\6
5\18х-54\18х=20\6+1\6
-49\18х=21\6
х=21\6*(-18\49)
х=-9\7
х=-1 2\7

Answer 2

Б) 5х+8-8х-14=9       в)2,7+у=9у-18,9        г)2,4-0,9у=3,2-0,8у+5,6      д)5/18х-1/6=3х+10/3
    -3х=15                       -8у=-21,6                  -0,1у=6,4                             49/18х=21/6
      х=-5                            у=2,7                       у=-64                                    х=9/7
                                                                                                                        х=1целая2/7

Comments

а в первом уровнении у тебя опечатка)