Vi sao 1 =100000000
100000000+100000000-100000000*100000000:100000000
1+1+2+2+3+3..........................................................................................................+100000000+100000000=?
Câu này con thấy đc
1+1+2+2+3+3+....+100000000+100000000=2(1+2+3+...+100000000)=2x100000000x100000001:2=100000000x100000001
1+1+2+2+3+3+...........+100000000+100000000=1+1+2+2+3+3+.........100000000+10000000.có đúng ko
100000000+100000000=?
100 000 000+ 100 000 000= 200 000 000
100000000+200000000+....+100000000+2000000000
= 6000000000000000000000000000000000
400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
1+2+3+4+...+100000000
Đặt A = 1+2+3+4+...+100000000 (có 100000000 số hạng)
A = (1+100000000) x 100000000 : 2
A = 100000001 x 100000000 : 2
A = 10000001 x 50000000
A = 5000000500000000
Vậy 1+2+3+4+...+100000000 = 5000000500000000
Đặt A = 1+2+3+4+...+100000000 (có 100000000 số hạng)
A = (1+100000000) x 100000000 : 2
A = 100000001 x 100000000 : 2
A = 10000001 x 50000000
A = 5000000500000000
Vậy 1+2+3+4+...+100000000 = 5000000500000000
tổng từ 1........100000000 là bao nhiêu?
1+2+3+4+5+6+7+8+9+...+100000000
từ 1 đến 100000000 có 100000000 số
tổng là:
100000000+1*100000000/2=5000000005000000
đ/s:5000000005000000
số số hạng là:
(100000000-1):1+1=100000000
tổng dãy số là:
\(\frac{100000000.\left(100000000+1\right)}{2}=5,0000005._{10^{^{14}}}\)
1+2+3+4+5+6+7+8+9+...+100000000
1+2+3+4+5+6+7+8+9+....+100000000= bấm máy tính nha bạn