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nguyển văn hải 15/08/2017 at 15:48
=(69 + 31)+(62+38)+(69+21)+79
=100+100+100+79
=100x3 + 79
=300 + 79=379
phanhuytien selected this answer. -
Help you solve math 15/08/2017 at 15:47
69+21+79+38+31+62
=(69+31)+(21+79)+(38+62)
=100+100+100
=100x3
=300