Tính a) 6/11 +1/2 b) 3/10 +5/21 c) 11/4 - 7/5 d) 20/18 -2/5
Giải thích
a) 611+12=1222+1122=2322
b) 310+521=63210+50210=113210
c) 114−75=5520−2820=2720
d) 2018−25=109−25=5045−1845=3245
a) 611+12=1222+1122=2322
b) 310+521=63210+50210=113210
c) 114−75=5520−2820=2720
d) 2018−25=109−25=5045−1845=3245