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dla x=3,5 i y= 5/6
2[4x-4y - 3x] -4[3x - 2x +3y]
8x -8y -6x -12x+8x -12y=-10x -20y= -10 x 3,5 -20 x 5/6= -35 - 16,66=
= -51,66
b.) a-2(b-1)+2[-5(a+1)-0,5a]+2b
dla a=4/5 i b=1/4
a -2b +2 +2[-5a -5 - 0,5a] + 2b= a -2b +2 -10a -10 -a +2b= -10a -8=
- 10 x 4/5 -10=-8 -8= - 16
proszę!!! ;))