Odpowiedź:
a)
7a - ( - 3a) = 7a + 3a = 10a
b)
- 9x - ( - 12x) = - 9x + 12x = 3x
c)
m - 1/4m = 4/4m - 1/4m = 3/4m
d)
0,5x - ( - 2,7x) = 0,5x + 2,7x = 3,2x
e)
- a - 7a = - 8a
f )
9x - x = 8x
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Odpowiedź:
a)
7a - ( - 3a) = 7a + 3a = 10a
b)
- 9x - ( - 12x) = - 9x + 12x = 3x
c)
m - 1/4m = 4/4m - 1/4m = 3/4m
d)
0,5x - ( - 2,7x) = 0,5x + 2,7x = 3,2x
e)
- a - 7a = - 8a
f )
9x - x = 8x