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Calculeaza in doua moduri

2x[31+4]=
6x[40-23]=
5x[3+2+15]=


Răspuns :

2*35=70
2*31+2*4=62+8=70
6*17=102
6*40+6*23=240-138=102
5*20=100
5*3+5*2+5*15=100