Odpowiedź:
4•50+5•20-7=200+100-7=307
5x-2y=5•1-2•2=5-4=1
6x+15x=21x
-12x+6x=-6x
-8x+3x=-5x
2x+y-x+4y=x+5y
0,5x+2,1y+3,7x-0,2y=4,2x+1,9y
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Odpowiedź:
4•50+5•20-7=200+100-7=307
5x-2y=5•1-2•2=5-4=1
6x+15x=21x
-12x+6x=-6x
-8x+3x=-5x
2x+y-x+4y=x+5y
0,5x+2,1y+3,7x-0,2y=4,2x+1,9y