问题
解答题
简算: 12×(
8.5-(6
2.25×
|
答案
(1)12×(
-2 3
+1 4
),1 6
=12×
-12×2 3
+12×1 4
,1 6
=8-3+2,
=7;
(2)8.5-(6
-3.875),1 2
=8.5-6
+3.875,1 2
=8.5-6.5+3.875,
=2+3.875,
=5.875;
(3)2.25×
-2.75×15 4
+3×225%,9 4
=2.25×3.75-2.75×2.25+3×2.25,
=2.25×(3.75-2.75+3),
=2.25×4,
=9.