B = 99 - 33 + 97 - 96 + 95 - 94 +...+49 - 48
B = (99 - 33 ) + ((97 - 96 ) + ( 95 - 94 ) + ...+( 49 - 48 ))
B = 33 + 25
B = 58
Vậy B = 58
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B = 99 - 33 + 97 - 96 + 95 - 94 +...+49 - 48
B = (99 - 33 ) + ((97 - 96 ) + ( 95 - 94 ) + ...+( 49 - 48 ))
B = 33 + 25
B = 58
Vậy B = 58
99-33+97-96+95-94+...... +49-48
A.100-99+98+97+96+95+...+4-3+2-1
B.100-98+96-94+...+4-2
91+92+93+94+95+96+97+98+99=
tính 99+98+97+96+95+94+93+92+91=
tính = 99+98+97+96+95+94+93+92+91=
Tính tổng: 99 + 98 + 97 + 96 + 95 + 94 + 93 + 92 + 91 = ?
100+98+96+94+...-4-2+99-97-95-...-3-1=?
A=100+98+96+94+92+...+2-99-97-95-93-91-...-1 = ?
A=100 - 99-98-97+ 96-95-94 - 93 + ............... + 4-3-2-1 = ?