Zadanie 7.2 str. 21 (Zbiór zadań)
Oblicz: x i sprawdź
a) 7 - x = 9
b) 36 + x = (-1)
c) x + 12,5 = 3,5
d) x - 8,25 = - 5,25
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a) 7 - x = 9
-x = 9-7
-x = 2 |:(-1)
x = -2
7-(-2) = 7+2 = 9
b) 36 + x = (-1)
x = -1-36
x = -37
36+(-37) = -1
c) x + 12,5 = 3,5
x = 3,5-12,5
x = -9
-9+12,5 = 3,5
d) x - 8,25 = - 5,25
x = -5,25+8,25
x = 3
3-8,25 = - 5,25
a) 7-x=9
-x=9-7 spr. &-(-2)=9
-x=2/*(-1)
x=-2
b) 36+x=(-1)
x=-37 spr. 36+(-37)=-1
c)x+12,5=3,5
x=3,5-12,5 spr. -9+12,5= -3,5
x=-9
d) x-8,25=-5,25
x=-5,25+8,25 spr.3-8,25=-5,25
x =3