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będzie to liczba 4 gdyż:
4*7=28
28-4=24
tak sadzę.
Zadanie 2
a)
2x-5+2x+7-3x=8
4x-5+7-3x=8
x+2=8/-2
x=6
b)
y=-4
a) 2x - 5 + 2 x + 7 - 3 x = 8
2x + 2x - 3x = 8 + 5 - 7
x = 6
b) 2y - 2 + 3y - 5y + 2 - y = 4
2y + 3y - 5y - y = 4 + 2 - 2
- y = 4 /(-1)
y = - 4
a) 2x - 5 + 2 x + 7 - 3 x = 8
x+2=8
x= 8-2
x=6 spr. 2*6 - 5 + 2 *6 + 7 - 3 *6 = 8
b) 2y - 2 + 3y - 5y + 2 - y = 4
-y = 4 /* (-1)
y=-4 spr.2*(-4) - 2 + 3*(-4) - 5*(-4) + 2 - (-4) = 4