(1/2 + 3/2 - 5/2) x ( 9/1000 - 8/1000 + 1/2019)
=( 4/2 - 5/2) x ( 1/1000 + 1/2019)
= (-1/2) x ...
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(1/2 +3/2-5/2) *(9/1000-8/1000+1/2019)
A=2^2019 -1 -2-2^2-2^3-....-2^2018
C=8+24+48+80+...+440
E=1-2^2+2^4-2^6+...+2^12-2^14+2^16
0+1+4+9+16+...+1000
1+2+3+4+5+6+7+8+9+...................+1000=?
Tính : A=1+2+3+4+5+6+7+8+9+...+1000
B=2+74+6+8+..+1000
C=1+3+5+7+9+...+1001
YOU CAN AFFORD ?
PLEASE PORVE TO ME THAT YOU ARE GOOD.
(1+2+3+4+5+6)+(7+8+9+10).12345+1000 = ?
1+2+3+4+5+6+7+8+9+10+11+12+...+1000
tính nhanh:
A = (-1) + 5 + (-9) + 13 + ... + (-41) + 45
B= 1-2-3+4+5-6-7+8+...+997 - 988 - 999 + 1000
tính nhanh:
A = (-1) + 5 + (-9) + 13 + ... + (-41) + 45
B= 1-2-3+4+5-6-7+8+...+997 - 988 - 999 + 1000
tinh
1+2+3+4+5+6+7+8+9...+1000:10 = ?