(
24
19 +
16
17 )÷8+
15
17
=
24
19 ×
1
8 +
16
17 ×
1
8 +
15
17
=
3
19 +(
2
17 +
15
17 )
=
3
19 +1
=1
3
19 ;
6.8×
8
25 +0.32×4.2-8÷25
=(6.8+4.2-1)×0.32
=10×0.32
=3.2.
(
24
19 +
16
17 )÷8+
15
17
=
24
19 ×
1
8 +
16
17 ×
1
8 +
15
17
=
3
19 +(
2
17 +
15
17 )
=
3
19 +1
=1
3
19 ;
6.8×
8
25 +0.32×4.2-8÷25
=(6.8+4.2-1)×0.32
=10×0.32
=3.2.