问题
解答题
|
答案
(1)1.25×25×3.2,
=(1.25×0.8)×(25×4),
=1×100,
=100;
(2)4.75+0.25×
,1 5
=4.75+0.05,
=4.8;
(3)21×(1-
)÷3 7
,3 16
=21×
×4 7
,16 3
=64;
(4)15.75-(2
+53 5
),3 4
=15.75-5.75-2.6,
=10-2.6,
=7.4;
(5)(6×
-4)÷2 3
,4 5
=(4-4)÷
,4 5
=0÷
,4 5
=0;
(6)
÷7 9
+11 5
×2 9
,5 11
=(
+7 9
)×2 9
,5 11
=1×
,5 11
=
.5 11