计算下列各题,能简便计算的用简便方法计算.5/6+(1/3-5/6) 3/10+1/5-1/3 7/9+1/12-11/18 3-5/11-17/11 5-4/7-一又七分之三2-2/3-7/12
问题描述:
计算下列各题,能简便计算的用简便方法计算.
5/6+(1/3-5/6) 3/10+1/5-1/3 7/9+1/12-11/18 3-5/11-17/11 5-4/7-一又七分之三
2-2/3-7/12
答
5/6+(1/3-5/6)(去括号)
=5/6-5/6+1/3
=1/3
3/10+1/5-1/3
=3/10+2/10-1/3
=5/10-1/3
=1/2-1/3(通分)
=1/6
7/9+1/12-11/18
=14/18-11/18+1/12
=3/18+1/12
=1/6+1/12
=2/12+1/12
=3/12
=1/4
3-5/11-17/11
=3-(5/11+17/11)
=3-22/11
=3-2
=1
5-4/7-一又七分之三
=5-4/7-10/7
=5-(4/7+10/7)
=5-14/7
=5-2
=3
2-2/3-7/12
=2-(8/12+7/12)
=2-15/12
=2-5/4
=2-1又1/4
=3/4