63乘62/61用简便计算；了.
问题描述：
63乘62/61用简便计算
；了.
答
63×62÷61
=（61+2）×（61+1）÷61
=[61×61+61×（2+1）+2×1]÷61
=61+3+2/61
=64+2/61
答
(61+2)*(62/61)=61*(62/61)+2*(62/61)=62+2*(61+1)/61=62+2+1/61=64+1/61貌似是这样！
答
63*(61+1)/61
=(63*61+63)/61
=(63*61+61+2)/61
=64+2/61
答
63乘62/61
=63*62/61
=63*(61+1)/61
=63+63/61
=63+1+2/61
=64+2/61
=64又2/61