①(
1
8 -
1
4 ÷4×
1
4 )÷
1
2 ,
=(
1
8 -
1
4 ×
1
4 ×
1
4 )÷
1
2 ,
=(
1
8 -
1
64 )×2,
=
7
64 × 2,
7
32 ;
②
23
24 ×23,
=
23
24 × (24-1),
=
23
24 × 24 -
23
24 ,
=23 -
23
24 ,
= 22
1
24 ;
③38
3
4 -15.38+61.25-3.62,
=38.75+61.25-(15.38+3.62),
=100-19,
=81;
④17.98+2.5×0.3-18÷1.5,
=17.98+0.75-12,
=18.73-12,
=6.73;
⑤
6
7 ×
3
4 +
1
4 ×
6
7 ,
=(
3
4 +
1
4 )×
6
7 ,
=1×
6
7 ,
=
6
7 ;
⑥(
7
8 +
7
16 )÷
7
16 .
=
7
8 ×
16
7 +
7
16 ×
16
7 ,
=2+1,
=3.