1) -3 * (х - 4) = 5х - 12;
-3х + 12 = 5х - 12;
-3х - 5х = -12 - 12;
-8х = -24;
х = 24 / 8 = 3;
2) (16 - 5х) - (3 - 5х) = 6;
16 - 5х - 3 +5х = 6;
13 - 0х = 6; 3) 26 - 4х = 3х - 7 * (х - 3);
26 - 4х = 3х - 7х + 21; 4) -2 * (3 - 4х) + 5 * (2 - 1 , 6х) = 4;
-6 + 8х + 10 - 8х = 4;
-6 + 8х + 10 - 8х - 4 = 0;
-4х + 4х = 21 - 26;
Пошаговое объяснение:
Пошаговое объяснение:
3/8 = 6/( x+13 ) ; 10/( x-3 ) = 5/7 ;
x + 13 = 8 * 6/3 ; x - 3 = 10 * 7/5 ;
x + 13 = 16 ; x - 3 = 14 ;
x = 16 - 13 ; x = 14 + 3 ;
x = 3 . x = 17 .
В - дь : х = 3 . В - дь : х = 17 .
