问题
解答题
用简便方法计算.(写出主要过程) 3.625+2
|
答案
(1)3.625+2
+41 13
+0.375,12 13
=(3.625+0.375)+(2
+41 13
),12 13
=4+7,
=11;
(2)
×71 4
+0.25×35 7
,2 7
=0.25×7
+0.25×35 7
,2 7
=0.25×(7
+35 7
),2 7
=0.25×(10+1),
=2.5+0.25,
=2.75.