问题
解答题
简便计算: (1)24.87-0.53-1.47 (2)50×(
(3)0.375×
|
答案
(1)24.87-0.53-1.47,
=24.87-(0.53+1.47),
=24.87-2,
=22.87;
(2)50×(
+3 10
-2 5
),6 25
=50×
+3 10
×50-50×2 5
,6 25
=15+20-12,
=35-12,
=23;
(3)0.375×
+15 2
-3 8
÷1 2
,8 3
=
×3 8
+15 2
-3 8
×1 2
,3 8
=(
+1-15 2
)×1 2
,3 8
=8×
,3 8
=3.