a = 3/54 + 5/126 + 7/294 + 8/609 + 13/1218
=> a = 3/6.9 + 5/9.14 + 7/14.21 + 8/21.29 + 13/29.42
=> a = 1/6 - 1/9 + 1/9 - 1/14 + 1/14 - 1/21 + 1/21 - 1/29 + 1/29 - 1/42
=> a = 1/6 - 1/42
=> a = 7/42 - 1/42
=> a = 6/42 = 1/7
\(\frac{3}{54}+\frac{5}{126}+\frac{7}{294}+\frac{8}{609}\)
tính bằng cách hợp lý
\(\frac{3}{54}+\frac{5}{126}+\frac{7}{294}\) chia \(\frac{5}{24}+\frac{5}{104}+\frac{5}{234}\)
Tinh nhanh: \(\frac{3}{54}+\frac{5}{126}+\frac{7}{294}\)tren \(\frac{5}{24}+\frac{5}{104}+\frac{5}{234}\)
(Day la phan so, tu so la 3 ps dau, mau so la 3 ps sau).Giup mik voi.Thanks!!!
3/54+5/126+7/294+8/609
1/. A = 3/54 + 5/ 126 + 7/ 294 + 8/609
TÍNH BẰNG CÁCH THUẬN TIỆN NHẤT
\(\frac{137\cdot15-40}{137+15-40}\cdot\frac{3+\frac{3}{7}-\frac{3}{11}+\frac{3}{1001}-\frac{3}{13}}{\frac{54}{1001}-\frac{54}{13}+\frac{54}{7}-\frac{54}{11}+54}\)
Tính giá trị biểu thức :
\(A=\frac{21}{54}+\frac{3}{75}chiacho\frac{0.96\cdot\frac{7}{3}}{30\frac{9}{12}+13\frac{5}{12}-16\frac{1}{6}}\)
a,\(13\frac{3}{7}+4\frac{5}{13}-8\frac{3}{7}\)
b,\(\left(6-2\frac{4}{5}\right).3\frac{1}{8}-1\frac{3}{5}:\frac{1}{4}\)
Cho A=\(\frac{\frac{1}{5}+\frac{1}{7}-\frac{1}{13}}{\frac{3}{5}+\frac{3}{7}-\frac{3}{13}}.\frac{\frac{3}{4}-\frac{3}{16}+\frac{1}{64}-\frac{3}{256}}{1-\frac{1}{4}+\frac{1}{16}-\frac{1}{64}}+\frac{5}{8}\)
a) Rút gọn A
b) tính 75% của A
