能简便就简便计算 2/3*2/7+7/12 1/7*6+1/7
问题描述:
能简便就简便计算 2/3*2/7+7/12 1/7*6+1/7
答
2/3*2/7+7/12
=4/21+7/12
=4*4/84+7*7/84
=16/84+49/84
=65/84
1/7*6+1/7
=1/7*(6+1)
=1/7*7
=1