0.1+0.2+0.3+0.4+...+0.x=4.5
bài 1:tìm X:0.1+0.2+0.3+0.4+...+0.X=4.5
Bài 2:Tính:10,1+11,12+12,13+...+97.98+98.99+99.100
bài 3:tính:1.3-3.2+5.1-7+8.9-10.8+....+35.5-37.4+39.3-41.2+43.1
tìm x biết
(x+0.1)+(x+0.2)+(x+0.3)+...................+(x+4.9)=44.2
0.1+0.2+0.3+0.4+.........+1.9=?
0.1+0.2+0.3+0.4+.............+0.19
0.1+0.2+0.3+.............
0.19=?
tính tổng 0.1+0.2+0.3+...+1.8+1.9
0.1+0.2+0.3+0.4+..................+9.6+9.7+9.8+9.9+10
tổng dãy số 0.1+0.2+0.3+0.4+...+0.19