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utilizind proprietatile si calculind cit mai simplu.a)4,28×5,9+5,72×5,9= b)17,2×45,9-17,,2×45,89= .

Răspuns :

a)4,28×5,9+5,72×5,9= 5,9×(4,28+5,72)=5,9 × 10= 59

b)17,2×45,9-17,2×45,89= 17,2
×(45,9-45,89)=17,2 × 0,01=0,172