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Lianamingalinsha
@Lianamingalinsha
July 2022
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2 вариант умоляю !!!!
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lena85
1.
а) -8а+3а-4а+15а=-12а+18а=6а
б) 3b-17b+5b-8=-9b-8
в) 7,4a-2,8b-5,7a-7,6b-1,4=1,7a-10,4b-1,4
г) 5/12х-3/10у-7/18х-5/18у = 15/36х-14/36х-27/90у-25/90у=1/36х-52/90у
2.
а)6(2х-7)+4(1-4х)=12х-42+4-16х=-4х-38
б)0,3(4х-у-5)-0,5(3у-2х)=1,2х-0,3у-1,5-1,5у+1х=2,2х-1,8у-1,5
3.
-7(2х+3)-(х-5)=-9
-14х-21-х+5=-9
-15х=-9+16
-15х=7
х=-7/15
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Answers & Comments
а) -8а+3а-4а+15а=-12а+18а=6а
б) 3b-17b+5b-8=-9b-8
в) 7,4a-2,8b-5,7a-7,6b-1,4=1,7a-10,4b-1,4
г) 5/12х-3/10у-7/18х-5/18у = 15/36х-14/36х-27/90у-25/90у=1/36х-52/90у
2.
а)6(2х-7)+4(1-4х)=12х-42+4-16х=-4х-38
б)0,3(4х-у-5)-0,5(3у-2х)=1,2х-0,3у-1,5-1,5у+1х=2,2х-1,8у-1,5
3.
-7(2х+3)-(х-5)=-9
-14х-21-х+5=-9
-15х=-9+16
-15х=7
х=-7/15