1. Zapisz w jaknajprostszej postaci :
a) 2a +7b - 5c + 4b - 5c + 3a
b) 2 (5a + 4b ) - (4a - 2b + 9 ) + (2a - 7 )
2.Wyłącz wspólny czynnik przed nawias :
a) 20a - 30b + 10c
b) 40ab + 2abc - 8ac
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zad.1.
a) 2a +7b - 5c + 4b - 5c + 3a = 5a + 11b - 10c
b) 2 (5a + 4b ) - (4a - 2b + 9 ) + (2a - 7 )= 10a + 8b - 4a + 2b - 9 + 2a - 7 = 8a + 10b - 16
zad.2.
a) 20a - 30b + 10c = 10( 2a - 3b + c)
b) 40ab + 2abc - 8ac = 2a( 20b + bc - 4c)