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a fost răspuns


Calculeaza grupand convenabil termenii.
135+136+.....+154+155+156+157
170+171+172+......+186+187+188
525+526+.....+.548+549+550

Răspuns :

135+136+....+154+155+156+157=(135+145)+(136+144)+(137+143)+(138+142)+(139+141)+140+(146+154)......+155+156+157=3358.