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Ответ

Ответ дан
svetazuna

(4х + 3у) / (4х - 3у) =

= (-3 - 1/2) / (-3 + 1/2) =

= -3 1/2 : (-2 1/2) =

= 7/2 : 5/2 =

= 7/2 * 2/5 = 7/5 = 1 2/5,

-4в+6+12в-8 = 8в - 2,

15а-а-3+2а-1 = 16а - 4,

5а-6а+7а-8а+9 = 9 - 2а

Ответ

Ответ дан
Darya45100

а)-2(2б-3)+4(3б-2)=-4б+6+12б-8=8б-2

б)15а - (а+3) + (2а-1)= 15а-а-3+2а-1=16а-4

в)5а - (6а-(7а-(9а-9)))=5а-(6а-7а+9а-9)=5а - 6а +7а -9а +9=9-3а

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