Rozwiąż równania algebraiczne:
a) 2+3(x-1)=5
b) 5z+2(4-z)=z
c) 4y-3(3y-5)=2y
d) 0,2(1-0,3x)=0,04x+1
a) 2+3(x-1)=52 + 3x - 3 = 53x = 5 - 2 + 33x = 6 /:3x = 2b) 5z+2(4-z)=z5z + 8 - 2z = z5z - 2z - z = -82z = -8 /:2 z = -4c) 4y-3(3y-5)=2y4y - 9y + 15 = 2y4y - 9y - 2y = -15 -7y = -15 /:(-7)y = 15/7d) 0,2(1-0,3x)=0,04x+10,2 - 0,06x = 0,04x + 1-0,06x - 0,04x = 1 - 0,2 -0,1x = 0,8 /:(-0,1)x = -8
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a)
2+3(x-1)=5
2 + 3x - 3 = 5
3x = 5 - 2 + 3
3x = 6 /:3
x = 2
b)
5z+2(4-z)=z
5z + 8 - 2z = z
5z - 2z - z = -8
2z = -8 /:2
z = -4
c)
4y-3(3y-5)=2y
4y - 9y + 15 = 2y
4y - 9y - 2y = -15
-7y = -15 /:(-7)
y = 15/7
d)
0,2(1-0,3x)=0,04x+1
0,2 - 0,06x = 0,04x + 1
-0,06x - 0,04x = 1 - 0,2
-0,1x = 0,8 /:(-0,1)
x = -8