D=1/1.5+1/5.9+...+1/41.45
4D=4/1.5+4/5.9+...+4/41.45
4D=1-1/5+1/5-1/9+...+1/41-1/45
4D=1-1/45
D=44/45:4=11/45
Đúng 2
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D=1/1.5+1/5.9+...+1/41.45
4D=4/1.5+4/5.9+...+4/41.45
4D=1-1/5+1/5-1/9+...+1/41-1/45
4D=1-1/45
D=44/45:4=11/45
1/1.5 + 1/5.9 + 1/9.13 + 1/13.17 + .....+ 1/41.45
cb kb với mk nha
1/4+1/3xX=1/2
mn lm nhanh giúp mik vs
3/4xX-1=1/2xX
mn lm nhanh giúp mik vs
1/6+1/12+1/20+1/30+...+1/420 mn lm nhanh giúp mik vs
1/5.9+1/1.13+1/13.17+ ...+1/41.45
3xX+X=20
mn lm nhanh giúp mik vs
X+X:0,5=27
mn lm nhanh giúp mik vs ak
Giải giúp mik bài toán
1/1.5+1/5.9+1/9.13+..+1/97.101
Cảm ơn nhiều^^
Tinh
A= 4/5.9 + 4/9.13 + 4/13.17 + ....+ 4/41.45
B= ( 1 - 1/2 ) . ( 1 - 1/3 ) . ( 1 - 1/4 ) ...... ( 1 - 1/100 )