问题
解答题
用简便方法计算.
|
答案
(1)1.25×32×0.25,
=1.25×8×4×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;
(2)5.2+
+3.8+5 8
,3 8
=(5.2+3.8)+(
+5 8
),3 8
=9+1,
=10;
(3)
÷7+8 13
×5 13
,1 7
=
×8 13
+1 7
×5 13
,1 7
=(
+8 13
)×5 13
,1 7
=1×
,1 7
=
;1 7
(4)7.25-84%-0.16,
=7.25-0.84-0.16,
=7.25-(0.84+0.16),
=7.25-1,
=6.25.