Rozwiąż równania: a) 2(3x+5)+4=20 b) (x-4)+(2x+2)=11 c) 5a-(3-a)=10-2a d) 5x+7=3x-1 Daje naj, Dużo pkt. <3
a)
2(3x+5)+4=20
6x+10+4=20
6x = 6 /:6
x = 1
b)
(x-4)+(2x+2)=11
x-4+2x+2=11
3x = 11+4-2
3x = 13 /:3
x = 4 1/3
c)
5a-(3-a)=10-2a
5a-3+a=10-2a
5a+a+2a=10+3
8a = 13 /:8
a = 13/8
a = 1 5/8
d)
5x+7=3x-1
5x-3x = -1-7
2x = -8 /:2
x = -4
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a)
2(3x+5)+4=20
6x+10+4=20
6x = 6 /:6
x = 1
b)
(x-4)+(2x+2)=11
x-4+2x+2=11
3x = 11+4-2
3x = 13 /:3
x = 4 1/3
c)
5a-(3-a)=10-2a
5a-3+a=10-2a
5a+a+2a=10+3
8a = 13 /:8
a = 13/8
a = 1 5/8
d)
5x+7=3x-1
5x-3x = -1-7
2x = -8 /:2
x = -4