4 x 20 x 25 x 5 x 125 x 10 x 10 x 8 = ( 25 x 4 ) x ( 20 x 5 ) x ( 125 x 8 ) x ( 10 x 10 )

                                                        = 100 x 100 x 1000 x 100

                                                        = 1 000 000 000

4x20x25x5x125x10x10x8

=(4x25)x(125x8)x(10x10)x(20x5)

=100x1000x100x100

=1000000000

mấy số , là hỗn số

Hỗn số là số giống dạng này nè bạn : \(1\frac{6}{5}\)

\(a,\frac{2}{5}:\frac{6}{5}+\frac{3}{4}.\frac{12}{5}\)

=\(\frac{2}{5}.\frac{5}{6}+\frac{9}{5}\)

=\(\frac{1}{3}+\frac{9}{5}\)

=\(\frac{32}{5}\)

b)  \(\frac{17}{5}.\frac{3}{5}.\frac{17}{5}.\frac{2}{5}\)

=\(\frac{17}{5}.\left(\frac{3}{5}.\frac{2}{5}\right)\)

=\(\frac{17}{5}.\frac{6}{25}\)

=\(\frac{102}{125}\)

c)\(\frac{1}{4}+\frac{3}{4}.\frac{2}{3}-\frac{1}{2}\)

=\(\frac{1}{4}+\frac{1}{2}-\frac{1}{2}\)

=\(\frac{1}{4}\)

d)\(\frac{6}{7}+\frac{5}{8}:5\)

=\(\frac{6}{7}+\frac{5}{8}.\frac{1}{5}\)

=\(\frac{6}{7}+\frac{1}{8}\)

=\(\frac{48}{56}+\frac{7}{56}\)

=\(\frac{55}{56}\)

tk nhé bn!

\(A=\frac{2}{35}+\frac{4}{77}+\frac{2}{143}+\frac{4}{221}+\frac{2}{223}+\frac{4}{437}+\frac{2}{575}\)

\(=\frac{2}{5.7}+\frac{2}{7.11}+\frac{2}{11.13}+\frac{4}{13.17}+\frac{2}{17.19}+\frac{4}{19.23}+\frac{2}{23.25}\)

\(=\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{13}+\frac{1}{13}-\frac{1}{17}+\frac{1}{17}-\frac{1}{19}+\frac{1}{19}-\frac{1}{23}+\frac{1}{23}-\frac{1}{25}\)

\(=\frac{1}{5}-\frac{1}{25}\)

\(=\frac{4}{25}\)

giúp mình với mình sắp phải thi chọn lớp rồi

Kết quả là 1/1004

A=1+3+5+7+...+197

SSH:(197-1):2+1=99(số)

A=(197+1)x99:2

=9801

Kết quả bằng 9801 nha bạn!

\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.....\frac{1002}{1003}.\frac{1003}{1004}\)

\(=\frac{1}{1004}\)

Tk giúp !!

a)=1/3-1/7+1/7-1/11+1/11-1/15+...+1/107-1/111

=1/3-1/111

a) Ta có: \(G=\frac{4}{3.7}+\frac{4}{7.11}+\frac{4}{11.15}+...+\frac{4}{107.111}\)

\(=\frac{1}{3}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{15}+...+\frac{1}{17}-\frac{1}{111}\)

\(=\frac{1}{3}-\frac{1}{111}\)

\(=\frac{12}{37}\)

Vậy \(G=\frac{12}{37}\)

5x7x77-49x15-14x25=1610

giải da bạn ơi