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87+2·(93·7-42·11)=x+300


Răspuns :

87+2*(651-462)=x+300
89*189=x+300
16821=x+300
x=16821-300
x=16521
87+2•(651-462)=x+300; 87+2•189=x+300; 87+378=x+300; 465=x+300; x=465-300; x=165