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a)
-2+2*1=0
-2-1=-3 TAK
B)
-2-4=-6
2-2(-4)=2+8=10 NIE
C)
-2*1+3*3=7
1+3=4 TAK
D)
3(-3)-(-1)=-9+1=-8
-3-1=-4 NIE
drugie zdjecie
e)
50%a=6-b
b=a+9
0,5a=6-b
-a+b=9
0,5a+b=6 I10
-a+b=9
5a+10b=60
-a+b=9 I(-10)
5a+10b=60
10a-10b=-90
+_____________________
15a=30 II15
a=2
a=2
b=2+9
a=2
b=11
f)
3x+4y=21,2 I10
4x+3y=20,1 I10
30x+40y=212 I(-2)
20x+30y=201 I3
-60x-80y=424
60x+90y=603
+______________
10y=1027 II10
y= 10,27
y=10,27
4x+3*10,27=20,1
y=10,27
4x+30,81=20,1
y=10,27
4x=-30,81+20,1
y=10,27
4x=-10,71 II4
y=10,27
x=2,68