问题
解答题
|
答案
(1)5.6×99+5.3,
=5.6×(100-1)+5.3,
=560-5.6+5.3,
=560-(5.6-5.3),
=560-0.3,
=559.7;
(2)12.5×32×25,
=12.5×8×4×25,
=(12.5×8)×(4×25),
=100×100,
=10000;
(3)
-0.25-6 5
,3 4
=
-6 5
-1 4
,3 4
=
-(6 5
+1 4
),3 4
=
-1,6 5
=
;1 5
(4)
÷[(3 5
+1 5
)÷1 3
],2 9
=
÷[3 5
÷8 15
],2 9
=
÷[3 5
×8 15
],9 2
=
÷3 5
,12 5
=
×3 5
,5 12
=
.1 4