〔解〕
(1)5 3 −
3 + 1 5
8 1 8
7
= 5 3 − 1 3 − 1 5
8 8 7
= 4 − 1 5
7
= 2 2 .
7
(2)10.5-2.37-2.63
=10.5-(2.37+2.63)
=10.5-5
=5.5。
(3)1 4 − 4 + 7 ×3
5 15 24
(1)5 3 −
3 + 1 5
8 1 8
7
= 5 3 − 1 3 − 1 5
8 8 7
= 4 − 1 5
7
= 2 2 .
7
(2)10.5-2.37-2.63
=10.5-(2.37+2.63)
=10.5-5
=5.5。
(3)1 4 − 4 + 7 ×3
5 15 24