问题
解答题
下面各题怎样简便怎样算. ①0.375×5.8+
②12÷
③(4.16×
|
答案
(1)0.375×5.8+
×5.8,5 8
=5.8×(0.375+
),5 8
=5.8×(
+3 8
),5 8
=5.8×1,
=5.8;
(2)12÷
-20×5%,4 7
=12×
-20×7 4
,1 20
=21-1,
=20;
(3)(4.16×
+39 11
×4.16)×25,2 11
=[4.16×(
+39 11
)]×25,2 11
=[4.16×4]×25,
=4.16×4×25,
=4.16×(4×25),
=4.16×100,
=416.