3/5+1/2*4/5
=1/5(3+1/2*4)
=1/5*(3+2)
=1/5*5
=1
(5/6-2/3)*10
=(5/6-4/6)*10
=10*1/6
=5/3
=1又3分之2
没什么简便运算,1/2*4/5=(1/2)*(4/5)=2/5,再加上3/5就等于1;
第二题=(5/6-4/6)*10=1/6*10=5/3
这类题最简便的方法就是同分,合并,算出结果
3/5+1/2*4/5
=3/5+2/5
=1
(5/6-2/3)*10
=(5/6-4/6)x10
=1/6x10
=5/3