Помогите пожалуйста!Номер 11 и 12. Created by slasteen13. algebra-ru

Помогите пожалуйста!Номер 11 и 12...

ЛараBlack Номер 111) 4(х-3) = х+64х-х = 6+73х = 13х = 4,3ОТВЕТ: 4,3.2) 4-6(х+2) = 3-5х4-6х+12 = 3-5х-6х+5х = 3-4-12-х = -13х = 13ОТВЕТ: 13.3) (5х+8) - (8х+14) = 95х+8-8х+14 = 95х-8х = 9-8-14-3х = -13х = 4,3.ОТВЕТ: 4,3.4) 2,7+3у = 9(у-2,1)2,7+3у = 9у-18,93у-9у = -18,9-2,7-6у = -21,6у = 3,6ОТВЕТ: 6,3.5) 0,3(8-3у) = 3,2-0,8(у-7)2,4-0,9у = 3,2-0,8у-5,60,8у-0,9у = 3,2-5,6-2,4-0,1у = -4,8у = 48ОТВЕТ: 48НОМЕР 12.1) 7х+3 = 3(2х-1)+х7х+3 = 6х-3+х7х-6х-х = -3+30 = 0ОТВЕТ: 0.2) 1,8(1-2х) = 7,8-(3,6+6)1,8-36х = 7,8-3,6х+6-36х+3,6х = 7,8+6-1,8-32,4х = 12х = -0,4.ОТВЕТ: -0,4.

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Лёленька16 4(х-3)=х+6
4х-12=х+6
4х-х=6+12
3х=18
х=6
2)4-6(х+2)=3-5х
4-6х-12=3-5х
-6х+5х=3-4+6
-1х=5
х=-5
3) (5х+8)-(8х+14)=9
5х+8-8х-14=9
5х-8х=9-8+14
-3х=15
х=-5
4) 2.7+3у=9(у-2.1)
2.7+3у=9у-18.9
3у-9у=-18.9-2.7
-6у=-21.6
у=3.6
5) 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

1 votes Thanks 1

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