Tính hợp lí 4/20+16/42+6/15+-3/5+2/21+-40/21+3/20
tính theo cách hợp lý
a)\(\dfrac{4}{20}+\dfrac{16}{42}+\dfrac{6}{15}+\dfrac{-3}{5}+\dfrac{2}{21}+\dfrac{-40}{21}+\dfrac{3}{20}\)
B)\(\dfrac{42}{46}+\dfrac{250}{186}+\dfrac{-2121}{2323}+\dfrac{-125125}{143143}\)
Loga
Toán lớp 6
