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b) -4a²b² (nie wiem, jak to mozna inaczej zapisac)
c) -0.5a³bc (jw)
=1½a
b) 2a(-2)ab²=(-4a²)ab²=-4a²b²
c) a²*(-0,5)abc=(-0,5a²)abc=-0,5a³bc
a²+1-a²+2a=1+2a
b)-4a*ab²=-4a²b²
c)0,5a³*abc=0,5ado 4bc