Zad 1
Sprawdźmy 1
4-7 ≠ 13
Sprawdźmy 5
20-7 = 13
odp.5
Zad 2
odp : b)
Zad 3
a) 5x = 25 |:5 x = 5
b) -9x = 72 |:9 -x = 8 |*(-1) x = -8
c) 3x+21 = 12 |-21 3x = -9 |:3 x=-3
d) 4x-8 = 3x+12 |+8 4x = 3x+20 |-3x x = 20
e) 3x+7 = 5x-12 |-3x 7 = 2x-12 |+12 19 = 2x |:2 x = 9,5
f) -5x-17 = 3 |+17 -5x = 20 |:5 -x = 4 |:(-1) x = -4
Odpowiedź:
zad.1
5
zad.2
b
zad.3
5x=25/:5
x=5
-9x=72/:-9
x=-8
3(x+7)=12
3x+21=12/-21
3x=-9/:3
x=-3
4(x+2)=3(x+4)
4x+8=3x+12/-8
4x=3x+4/-3x
x=4
3x+7=5x-12/-3x
7=2x-12/+12
19=2x/:2
9,5=x
x-7-2(3x+5)=3
zaraz dokończę
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Zad 1
Sprawdźmy 1
4-7 ≠ 13
Sprawdźmy 5
20-7 = 13
odp.5
Zad 2
odp : b)
Zad 3
a) 5x = 25 |:5 x = 5
b) -9x = 72 |:9 -x = 8 |*(-1) x = -8
c) 3x+21 = 12 |-21 3x = -9 |:3 x=-3
d) 4x-8 = 3x+12 |+8 4x = 3x+20 |-3x x = 20
e) 3x+7 = 5x-12 |-3x 7 = 2x-12 |+12 19 = 2x |:2 x = 9,5
f) -5x-17 = 3 |+17 -5x = 20 |:5 -x = 4 |:(-1) x = -4
Odpowiedź:
zad.1
5
zad.2
b
zad.3
5x=25/:5
x=5
-9x=72/:-9
x=-8
3(x+7)=12
3x+21=12/-21
3x=-9/:3
x=-3
4(x+2)=3(x+4)
4x+8=3x+12/-8
4x=3x+4/-3x
x=4
3x+7=5x-12/-3x
7=2x-12/+12
19=2x/:2
9,5=x
x-7-2(3x+5)=3
zaraz dokończę