решите уравнение a) -6x9(x+2)=4x-17; б)(18x-19)-(4-7x)=-73; в)10x+3(7-2x)=13+2x; г)-3(4-5y)+2(3-6y)=-39. Created by samaya02. matematika-ru

решите уравнение a) -6x9(x+2)=4x-17; б)(18x-19)-(4-7x)=-73; в)10x+3(7-2x)=13+2x;...

panasura88 А) -6 * 9(х + 2) = 4х - 17 б) (18х - 19) - (4 - 7х) = -73
-54(х + 2) = 4х -17 18х - 19 - 4 + 7х = -73
-54х - 108 = 4х - 17 18х + 7х = -73 + 19 + 4
-54х - 4х = -17 + 108 25х = -50
-58х = 91    х = -50 : 25
х = -91/58 х = -2
х = -1 целая 33/58

в) 10х + 3(7 - 2х) = 13 + 2х г) -3(4 - 5у) + 2(3 - 6у) = -39
10х + 21 - 6х = 13 + 2х -12 + 15у + 6 - 12у = -39
10х - 6х - 2х = 13 - 21    15у - 12у = -39 + 12 - 6
2х = -8 3у = - 33
х = -8 : 2    у = -33 : 3
х = -4    у = -11

1 votes Thanks 2

prettypushkova

Verified answer

1)-6*9(х+2)= 4х-17
-54(х+2) = 4х-17
-54х-108= 4х-17
-54х-4х=-17+108
-58х=91
х=91/58
2) -18х-19-4-7х=-73
25х=-50
х=-2

5 votes Thanks 6

samaya02 очень очень спасибо

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