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(2m-4) - 2(m-5) =  

(9 + 33): (-6) =  

m2 - n2 -1 für m = 4, n = 3  

2m3((-3)m3)2 :(3m9) =  

(10 + 20 : 4 ) : 3 - 1 =  

-30 + 5 -(-21) =  

(-5)(-4) - 24 =  

2(5 - (-4 +2) -10) =