问题
解答题
计算下列各题(能简算的要简算) (
0.25×
(1
|
答案
(1)(
+2 3
)×45,2 15
=
×45+2 3
×45,2 15
=30+6,
=36;
(2)
×3 13
+2 5
×0.8-0.8,10 13
=
×3 13
+2 5
×2×10 13
-2×2 5
,2 5
=
×(2 5
+3 13
-2),20 13
=
×(-2 5
),3 13
=-
;6 65
(3)0.25×
×4×1.6,5 8
=(0.25×4)×(
×1.6),5 8
=1×1,
=1;
(4)(1
+2.25)÷[(31 2
-11 3
)÷11 2
],2 9
=(1.5+2.25)÷[
×11 6
],9 11
=3.75÷
,3 2
=3.75×
,2 3
=2.5.