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4(x-y) - (-x+y) =
4x-4y+x-y=
5x-5y
5*3/2-5*(-1)=15/2+5=7,5+5=12,5
b)
4(y-3)-3(x+1)=
4y-12-3x-3=
-3x+4y-15
-3*4+4*2-15= -12+8-15= -19
c)
3(2b+1) - 4(a-2)=
6b+3-4a+8=
-4a+6b+11
-4*7+6*1+11= -28+6+11= -11
4(1.1/2(jeden i jedna druga) + 1) - (-1.1/2 - 1)
6 + 4 - 1/2
10 - 1/2
9. 1/2 ( dziewięć i jedna druga )
b) 4(2 - 3) - 3(4 + 1)
8 - 12 - 12 - 3
- 19
c) 3([2 · 1]+ 1) - 4(7 - 2)
3(2+1) -4(7- 2)
6 + 3 - 28 + 8
17 - 28
-11