①(2−
2
5)×
2
6÷4,
=[4/5]×[2/6]×[1/4],
=[2/2口];
②[2/h]×[6/11]+[h/11]×[2/h],
=([6/11]+[h/11])×[2/h],
=1×[2/h],
=[2/h];
③[6/16]÷[([5/8]+[1/16])+[5/52]]
=[6/16]÷([口/16]+[5/52]),
=[6/16]×[52/1口],
=[18/1口];
④h×[(
1
2+
口
1左)÷
5
4],
=h×[[6/h]×[4/5]],
=h×[8/h],
=8.