问题
解答题
|
答案
(1)0.8×6.5-
×3.5,4 5
=0.8×6.5-0.8×3.5,
=(6.5-3.5)×0.8,
=3×0.8,
=2.4;
(2)(
+1 15
)×45,7 9
=
×45+1 15
×45,7 9
=3+35,
=38;
(3)1-
÷8 15
+4 5
,2 3
=1-
×8 15
+5 4
,2 3
=1-
+2 3
,2 3
=1;
(4)25×1.25×32,
=25×1.25×8×4,
=25×4×(1.25×8),
=100×10,
=1000;
(5)99×
+9 10
,9 10
=(99+1)×
,9 10
=100×
,9 10
=90;
(6)1
-9 14
-7 8
,1 8
=1
-(9 14
+7 8
),1 8
=1
-1,9 14
=
.9 14