Question

tính nhanh:   \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)

Answer 1

(1980-1978).1979=2.1979=3958

Answer 2

 1980.1979-1978.1979

=(1980-1978)x1979

=2x1979

=3958

Answer 3

1978.1979+1980.21+1958

=3914462+41580+1958

=3956042+1958

=3956240

1980.1979-1978.1979

=3918420-3914462

=3958

li-ke cho mình nha

Answer 4

\(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)=\(\frac{1978.1979+1979.21+21+1958}{1979.\left(1980-1978\right)}\)

=\(\frac{1979.\left(1978+21\right)+21+1958}{1979.2}\)= \(\frac{1979.\left(1978+21+1\right)}{1979.2}\)

=\(\frac{1979.2000}{1979.2}=1000\)

Vậy = 1000

Answer 5

Mk làm violympic 3958 là sai

Answer 6

1000 nha