Szczegółowe wyjaśnienie:
1.
a) 4*6 + 5 = 24 + 5 = 29
b)7 - 2*(-2) = 7 + 4 = 11
c)3*3 - 1 = 9 - 1 = 8
d)6 * 1 + 9 = 6 + 9 = 15 15≠18
2.
a)2*5 - 7 = 10 - 7 = 3
b)6 - 4*(-1) = 6+ 4 = 10 10≠2
c)-5*(-1) - 8 = 5 - 8 = -3
d)9*4 + 6 = 36 + 6 = 42 42≠-28
3.
a)4*(-2 +1) = 4 * -1 = -4
b)3*(-3) + 2 = -9 + 2 = -7
5 + 4*(-3) = 5 + (-12) = -7
c)-5 + 2*1 = -3
7 + 4*1 = 7 + 4 = 11
-3≠11
d)3*(1 + 4) = 3*5 = 15
4*4 - 1 = 16 - 1 = 15
4.
a)2x + 1 + x = 8 | -1
3x = 8-1
3x = 7 /3
x = [tex]\frac{7}{3}[/tex]
b)2x + 4 - 7x = 9 |-4
-5x = 9 - 4
-5x = 5 /-5
x = -1
5.
a)x + 3x + x = 15
5x = 15 /5
x = 3
b)x + 3x + 3x+ - 4 = 38 |+4
7x = 38 + 4
7x = 42 /7
x = 6
c)x + x - 30 + x + 3 + 40 = 100
3x + 13 = 100 |-13
3x = 87 /3
x = 29
d)-2x + 5 + x +6 + 4x - x = 31
2x + 11 = 31 |-11
2x = 20 /2
x = 10
