Odpowiedź:
zad10
a) 2(x+4)+6x=8
2x + 8 + 6x = 8 /-8
8x = 0 - równanie sprzeczne
b) 5x - 2(x+4) = 10
5x - 2x - 8 = 10 /+8
3x = 18 /:3
x = 6
c) -4 + 4(2-5x) = -9
-4 + 8 - 20x = -9 /-4
-20x = -13 /:(-20)
x = 0,65
zad11
a) x+3 = 2x /-x
3 = x
b) 3x = x+16 /-x
2x = 16 /:2
x = 8
c) x*4-20 = 8 /+20
4x = 28 /:4
x = 7
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Odpowiedź:
zad10
a) 2(x+4)+6x=8
2x + 8 + 6x = 8 /-8
8x = 0 - równanie sprzeczne
b) 5x - 2(x+4) = 10
5x - 2x - 8 = 10 /+8
3x = 18 /:3
x = 6
c) -4 + 4(2-5x) = -9
-4 + 8 - 20x = -9 /-4
-20x = -13 /:(-20)
x = 0,65
zad11
a) x+3 = 2x /-x
3 = x
b) 3x = x+16 /-x
2x = 16 /:2
x = 8
c) x*4-20 = 8 /+20
4x = 28 /:4
x = 7