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Ma gandesc la un nr ,il adun cu el insusi apoi scad 170,adaug 550,mai scad 90si obtin 660.La ce nr m.am gandit?

Răspuns :


x+x-170+550-90=660

2x+290=660

2x=660-290

x=185
m+m-170+550-90=660
2m-170+550=660+90
2m-170+550=750
2m-170=750-550
2m-170=200
2m=200+170
2m=370
m=370:2
m=185

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