Tính hợp lí
B1: tinh hop li
A) -5/14+3/8-2/14-3/8+1/2
B) 7/15-5/7+23/15+5/7-3/5
C) -3/17.2/3+2/3.-14/17
D) -5/7.3/11+-5/7.8/11
e)3/7+5/8+3/7.11/8+11/7
f)4.2^3:(2^7.1/32
A) -5/14+3/8-2/14-3/8+1/2
B) 7/15-5/7+23/15+5/7-3/5
C) -3/17.2/3+2/3.-14/17
D) -5/7.3/11+-5/7.8/11
e)3/7+5/8+3/7.11/8+11/7
f)4.2^3:(2^7.1/32