问题
解答题
用简便方法计算 5-
4.9×6.4+14×0.36-6.4×3.5. |
答案
(1)5-
÷9 4
-45 8
,3 5
=5-
×9 4
-8 45
,3 5
=5-
-2 5
,3 5
=5-(
+2 5
),3 5
=5-1,
=4;
(2)4.9×6.4+14×0.36-6.4×3.5,
=(4.9-3.5)×6.4+14×0.36,
=1.4×6.4+14×0.36,
=1.4×6.4+1.4×3.6,
=1.4×(6.4+3.6),
=1.4×10,
=14.