Question

[Left Eyes]

1/ tính bằng 2 cách hợp lí: (1981 x 1982 - 990) : (1980 x 1982 + 992)

2/ tìm x ;y :

\(\frac{ }{x,y}=\frac{ }{y,x}x3+1,3\)

Answer 1

[Phong Linh]

(1981 x 1982 - 990) : (1980 x 1982 + 992)

=(1980 x 1982+1982 -990) : (1980 x 1982 +992)

=(1980 x 1982 + 992) : ( 1980 x 1982 + 992)

=1