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Rezolva ploblema:2+2x(15+10:2)-20=.

Răspuns :

2+2(15+10:2)-20=
=
2+2(15+5)-20
=2+2
·20-20
=2+40-20
=22
2+2×(15+5)-20= 2+2×20-20=2+40-20= 42-20 =22