Question

121.75.130.169/39.60.11.198

1998.1990+3978/1992.1991-3984

Answer 1

giúp mk vs

Answer 2

Câu thứ 2 hình như bị sai đề

Answer 3

1998 sửa thành 1989

Answer 4

\(\frac{121.75.130.169}{39.60.11.198}\\ =\frac{11.11.5.15.13.10.13.13}{13.3.15.4.11.11.18}\)

\(=\frac{5.10.13.13}{3.4.18}\)

\(=\frac{4225}{108}\)

Answer 5

Câu 1

121×75×130×19/39×60×11×198

=11×11×15×5×130×13×13/13×13×15×4×11×11×18

=5×130/4×18=650/72325/36

Câu 2

1998×1990+3978/1992×1991-3984

=3976020/3962088=> 994005/990522

Answer 6

\(\frac{1989.1990+3978}{1992.1991-3984}\)

\(=\frac{1989.1990+1989.2}{1992.1991-1992.2}\)

\(=\frac{1989.\left(1990+2\right)}{1992.\left(1991-2\right)}\)

\(=\frac{1989.1992}{1992.1989}\)

\(=1\)

HOK TỐT

Answer 7

1)121.75.130.169/39.60.11.198

 =11.11.3.25.13.10.169/13.3.6.10.11.11.18

 =25.169/6.18=4225/108

Answer 8

2)1989.1990+3978/1992.1991-3984

=1989.1990+1989.2/1992.1991-1992.2

=1989.(1990+2)/1992.(1991-2)

=1989.1992/1992.1989=1