Tính a) -3/8 + 2/5 b) 9/7 - 1/5 c) 7/11 -(-1/3) d) -11/33 -(1/-4)
Giải thích
a) −38+25=−15+1640=140
b) 97−15=45−735=3835
c) 711−−13=711+13=21+1133=1
d) −1133−1−4=−13+14=−4+312=−112
a) −38+25=−15+1640=140
b) 97−15=45−735=3835
c) 711−−13=711+13=21+1133=1
d) −1133−1−4=−13+14=−4+312=−112