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hfxggg
@hfxggg
June 2022
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Larisaremizowa
1)
(х-2)/6+х/2=(5х-2)/9
(х-2+3х)/6=(5х-2)/9
(4х-2)/6=(5х-2)/9
2(2х-1)/6=(5х-2)/9
(2х-1)/3=(5х-2)/9
применим свойство пропорции : произведение краних членов равно произведению средних.
9(2х-1)=3(5х-2)
18х-9=15х-6
18х-15х=-6+9
3х=3
х=3:3
х=1
Ответ:1
2)
(5+2х)/3=(х-3)/5+(х+5)/2
(5+2х)/3=2(х-3)+5(х+5)/10
(5+2х)/3=(2х-6+5х+25)/10
(5+2х)/3=(7х+19)/10
10(5+2х)=3(7х+19)
50+20х=21х+57
20х-21х=57-50
-х=7
х=-7
Ответ:-7
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Answers & Comments
(х-2)/6+х/2=(5х-2)/9
(х-2+3х)/6=(5х-2)/9
(4х-2)/6=(5х-2)/9
2(2х-1)/6=(5х-2)/9
(2х-1)/3=(5х-2)/9
применим свойство пропорции : произведение краних членов равно произведению средних.
9(2х-1)=3(5х-2)
18х-9=15х-6
18х-15х=-6+9
3х=3
х=3:3
х=1
Ответ:1
2)
(5+2х)/3=(х-3)/5+(х+5)/2
(5+2х)/3=2(х-3)+5(х+5)/10
(5+2х)/3=(2х-6+5х+25)/10
(5+2х)/3=(7х+19)/10
10(5+2х)=3(7х+19)
50+20х=21х+57
20х-21х=57-50
-х=7
х=-7
Ответ:-7