=(10001-1+1).(10001+1):2
=10001.10002:2
=100030002:2
=50015001
CHAC CHAN DUNG LUON !
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=(10001-1+1).(10001+1):2
=10001.10002:2
=100030002:2
=50015001
CHAC CHAN DUNG LUON !
1+2+3+4+5.......+10000+10001
Tính nhanh : \(\frac{10000}{10001}-\frac{9999}{10000}+\frac{1}{9999}-\frac{1}{10000}+...+\frac{3}{4}-\frac{2}{3}+\frac{1}{2}-\frac{1}{3}\)
1+2+3+...+10000+10001+...+20000+20001
Tính A = \(\frac{1+2+3+4+5+....+10000}{2+4+6+8+10+...+10000}\)
C=1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+...+1/999*10000
1+1+1+1+1+1+1+1+1+....+1=?
có 10000 số 1
2+2+2+2+2+2+2+2+2+....+2=?
có 10000 số 2
0+1+2+3+4+5+6+7+8+9+....+10000=?
1+2+3+4+5+6+7+8+10+...........+9999+10000
bằng bao nhiêu các bạn
So sanh A va B biet A=1×3×5×7ו••×9997×9999 va B=2×4×6ו••×9998×10000