Tính Nhanh
3/11*2/5+4/7-6/55
2:3/11+3/7+5/11
21+22+23.......+98
\(\dfrac{5}{6}:4=\)
\(\dfrac{10}{11}-\dfrac{3}{22}\)
Tính nhanh
1+2+3+4+5+6
11+22+33+44+55+66
1/2 +3/6 + 5/10 + 7/14 + 9/18 +11/22=
Tính 1/2+3/6+5/10+7/14+9/18+11/22
Tính : 1/2 +3/6 +5/10 +7/14+9/18 +11/22
\(\dfrac{16}{21}\) + \(\dfrac{6}{7}\) ; \(\dfrac{15}{22}\) x \(\dfrac{11}{35}\) ; \(\dfrac{8}{11}\) : \(\dfrac{5}{22}\) ; \(\dfrac{9}{13}\) : \(\dfrac{27}{39}\) .
1+2+3+4+5+6+7+8+9+11+22+33+44+55+66+77+88+99
Viết tiếp 3 số hạng vào dãy số sau :
a, 1, 3, 4, 7, 11, 18, ...
b, 0, 2, 4, 6, 12, 22, ...
c, 0, 3, 7, 12, ...
d, 1, 2, 6, 24, ...