Tính nhanh 1/90:0,25 +1/90:0,2 +1/90 :0,5 +1/90:0,125-1/90 :0,1
B1 2,4nhan3+1,8nhan4+1,2nhan6+3,6nhan2+14,4+7,2nhan4
1/90:0,25+1/90:0,2+1/90:0,5+1/90:0,125-1/90:0,1
B3. 0,36 nhân 630 + 0,6 nhân 36 nhân 6 +3,6
1/90 : 0,25 + 1/90 : 0,2 + 1/90 : 0,125 - 1/90 : 0,1
Mình cần gấp !
\(\frac{1}{2}\) : 0,5 - \(\frac{1}{4}\):0,25 + \(\frac{1}{8}\): 0,125 - \(\frac{1}{10}\):0,1
tính nhanh nha
Tính bằng cách thuận tiên nhất :
\(\frac{1}{2}\): 0,5 - \(\frac{1}{4}\): 0,25 + \(\frac{1}{8}\): 0,125 - \(\frac{1}{10}\): 0,1 =
\(A=\frac{1}{18}+\frac{1}{36}+\frac{1}{60}+\frac{1}{90}+\frac{1}{126}+\frac{1}{168}\)
Tính nhanh:
a)\(\frac{5}{30}+\frac{15}{90}+\frac{25}{150}+\frac{35}{210}+\frac{45}{270}\)
b)\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{56}\)
c)\(\frac{1}{15}+\frac{4}{30}+\frac{2}{45}+\frac{16}{60}+\frac{25}{75}+\frac{36}{90}+\frac{49}{105}+\frac{64}{120}+\frac{81}{135}\)
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+.....+\frac{1}{72}+\frac{1}{90}\)
Tinh
\(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{90}+\frac{1}{100}\)