7/8-1/3-1/8+2/3脱式计算?
解析:
7/8-1/3-1/8+2/3
=(7/8-1/8)+(2/3-1/3)
=3/4+1/3
=13/12
加减法的运算可以变换计算顺序。原式等于7/8-1/8-1/3+2/3等于6/8-1/3等于18/24-8/24等于10/24等于5/12。
先分母通分后再加减
7/8-1/3-1/8+2/3
=21/24-8/24-3/24+16/24
=(21-8-3+16)/24
=26/24
=13/12
7/8-1/3-1/8+2/3
=(7/8-1/8)+(2/3-1/3)
=3/4+1/3
=9/12+4/12
=13/12