问题
解答题
6.5-(1.6÷5-0.3) 7.2-2.7÷15-0.82
|
答案
(1)6.5-(1.6÷5-0.3),
=6.5-(0.32-0.3),
=6.5-0.02,
=6.48;
(2)7.2-2.7÷15-0.82,
=7.2-0.18-0.82,
=7.2-(0.18+0.82),
=7.2-1,
=6.2;
(3)
×31-1÷3 8
,3 8
=
-93 8
,8 3
=
;215 24
(4)
÷[9 10
×(1 2
-6 5
)],3 10
=
÷[9 10
×1 2
],9 10
=
÷9 10
,9 20
=2.