Toán Lớp 5: tính nhanh
102-96+90-84+78-72+…- 12+ 6
1+2-3-4+5+6-7-8+….993+994-995-996+997+998
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Toán Lớp 5: tính nhanh
102-96+90-84+78-72+…- 12+ 6
1+2-3-4+5+6-7-8+….993+994-995-996+997+998
Comments ( 2 )
=6+6+6+6+……………………….+6
=8×6+6
=54
1+2-3-4+5+6-7-8+….993+994-995-996+997+998
=1+(2-3-4+5)+……………..+(994-995-996+997)+998
=1+0+0+…………………+998
=999