问题
解答题
用简便方法计算.(要写出简算过程) ①10.8-5.9-4.1 ②
|
答案
①10.8-5.9-4.1,
=10.8-(5.9+4.1),
=10.8-10,
=0.8;
②
×8+8×3 4
,1 4
=8×(
+3 4
),1 4
=8×1,
=8.
用简便方法计算.(要写出简算过程) ①10.8-5.9-4.1 ②
|
①10.8-5.9-4.1,
=10.8-(5.9+4.1),
=10.8-10,
=0.8;
②
×8+8×3 4
,1 4
=8×(
+3 4
),1 4
=8×1,
=8.