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bằng 300 nha
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x + 900 = 100 +1500
x + 900 = 1600
x = 1600 - 900
x = 700
ai nhanh mik k va k lai mik nha
mik nhanh nh
ất k mik ^_^
Trả lời :
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
= ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 10 + 5
= 10 + 10 + 10 + 10 + 10 + 5
= 10 x 5 + 5
= 50 + 5
= 55
~Moon~
= 1784 nha
100 + 1000 - 289 + 389
= 88