Các câu hỏi tương tự
Tính nhanh: \(\left(\frac{1}{49}-\frac{1}{2^2}\right)\times\left(\frac{1}{49}-\frac{1}{3^2}\right)\times...\times\left(\frac{1}{49}-\frac{1}{40^2}\right)\)
Thực hiện phép tính \(A=\left(\frac{1}{4.9}+\frac{1}{9.14}+...+\frac{1}{44.49}\right).\left(\frac{1-3-5-7-...-49}{89}\right)\)
thực hiện phép tính \(\left(\frac{1}{4.9}+\frac{1}{9.14}+\frac{1}{14.19}....+\frac{1}{44.49}\right).\frac{1-3-5-7-...-49}{89}\)
Tính:
\(\left(\frac{1}{4\cdot9}+\frac{1}{9\cdot14}+\frac{1}{14\cdot19}+...+\frac{1}{44\cdot49}\right)\cdot\frac{1-3-5-7-...-49}{89}\)
Thực hiện phép tính
\(\left(\frac{1}{4.9}+\frac{1}{9.14}+\frac{1}{14.19}+...+\frac{1}{44.49}\right)\frac{1-3-5-7-...-49}{89}\)
\(A=\left(\frac{1}{4\cdot9}+\frac{1}{9\cdot14}+\frac{1}{14\cdot19}+...+\frac{1}{44\cdot49}\right)\cdot\frac{1-3-5-7-...-49}{89}\)
\(\left(\frac{1}{4\cdot9}+\frac{1}{9\cdot14}+\frac{1}{14\cdot19}+\frac{1}{19\cdot24}+.....+\frac{1}{44\cdot49}\right)1\frac{-3-5-7-...-49}{89}\)
1.Tính:left(frac{1}{4times9}+frac{1}{9times14}+frac{1}{14times19}+...+frac{1}{44times49}right)timesfrac{1-3-5-7-...-49}{89}2.Cho frac{a}{2b}frac{b}{2c}frac{c}{2d}frac{d}{2a}. Tính: Afrac{2019a-2018b}{c+d}+frac{2019b-2018c}{a+d}+frac{2019c-2018d}{a+b}+frac{2019d-2018a}{b+c}3.Tìm x biết:left(x-1right)left(x-3right) 0
Đọc tiếp
1.Tính:
\(\left(\frac{1}{4\times9}+\frac{1}{9\times14}+\frac{1}{14\times19}+...+\frac{1}{44\times49}\right)\times\frac{1-3-5-7-...-49}{89}\)
2.Cho \(\frac{a}{2b}=\frac{b}{2c}=\frac{c}{2d}=\frac{d}{2a}\). Tính: \(A=\frac{2019a-2018b}{c+d}+\frac{2019b-2018c}{a+d}+\frac{2019c-2018d}{a+b}+\frac{2019d-2018a}{b+c}\)
3.Tìm x biết:\(\left(x-1\right)\left(x-3\right)< 0\)
1.Thực hiện phép tính:(hepl me)a)4frac{5}{9}:left(frac{-5}{7}right)+frac{49}{9}:left(frac{-5}{7}right)b)left(frac{-3}{5}+frac{4}{9}right):frac{7}{11}+left(frac{-2}{5}+frac{5}{9}right):frac{7}{11}c)left(frac{3}{4}right)^4timesleft(frac{8}{9}right)^2d)left(frac{-3}{5}right)^6timesleft(-frac{5}{3}right)^5 e)frac{8^{14}}{4^4times64^5}f)frac{9^{10}times27^7}{81^7times3^{15}}
Đọc tiếp
1.Thực hiện phép tính:(hepl me)
a)\(4\frac{5}{9}:\left(\frac{-5}{7}\right)+\frac{49}{9}:\left(\frac{-5}{7}\right)\)
b)\(\left(\frac{-3}{5}+\frac{4}{9}\right):\frac{7}{11}+\left(\frac{-2}{5}+\frac{5}{9}\right):\frac{7}{11}\)
c)\(\left(\frac{3}{4}\right)^4\times\left(\frac{8}{9}\right)^2\)
d)\(\left(\frac{-3}{5}\right)^6\times\left(-\frac{5}{3}\right)^5\)
e)\(\frac{8^{14}}{4^4\times64^5}\)
f)\(\frac{9^{10}\times27^7}{81^7\times3^{15}}\)