问题
解答题
简算 2.25×
2.5×(1.9+1.9+1.9+1.9) |
答案
(1)2.25×
+1.75×3 5
+0.6,3 5
=2.25×
+1.75×3 5
+1×3 5
,3 5
=(2.25+1.75+1)×
,3 5
=5×
,3 5
=3;
(2)2.5×(1.9+1.9+1.9+1.9),
=2.5×1.9×4,
=(2.5×4)×1.9,
=10×1.9,
=19.
简算 2.25×
2.5×(1.9+1.9+1.9+1.9) |
(1)2.25×
+1.75×3 5
+0.6,3 5
=2.25×
+1.75×3 5
+1×3 5
,3 5
=(2.25+1.75+1)×
,3 5
=5×
,3 5
=3;
(2)2.5×(1.9+1.9+1.9+1.9),
=2.5×1.9×4,
=(2.5×4)×1.9,
=10×1.9,
=19.