zbiór zadan zadanie 2 strona 70 .
a) 2(3x+4)-3(5x-6)+4(7x+8)=115
b)-0,8(10-2x)+1,2(x-20)+1/5x=-58
c)x(x-5)-x(x+4)=-63
a)
2(3x+4)-3(5x-6)+4(7x+8)=115
6x +8 -15x + 18 +28x +32 = 115
19x +58 = 115
19x= 115-58
19x = 57 /:19
x= 3
b)
-0,8(10-2x)+1,2(x-20)+1/5x=-58
-8 +1,6x +1,2x -24 + 0,2 x = -58
3x -32 = -58
3x= -58+32
3x =-26/:3
x= -8 2/3
c)
x(x-5)-x(x+4)=-63
x^2 -5x -x^2 -4x = -63
-9x = -63 /:(-9)
x= 7
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a)
2(3x+4)-3(5x-6)+4(7x+8)=115
6x +8 -15x + 18 +28x +32 = 115
19x +58 = 115
19x= 115-58
19x = 57 /:19
x= 3
b)
-0,8(10-2x)+1,2(x-20)+1/5x=-58
-8 +1,6x +1,2x -24 + 0,2 x = -58
3x -32 = -58
3x= -58+32
3x =-26/:3
x= -8 2/3
c)
x(x-5)-x(x+4)=-63
x^2 -5x -x^2 -4x = -63
-9x = -63 /:(-9)
x= 7