题目内容

用简便方法计算
5-
9
4
÷
45
8
-
3
5

4.9×6.4+14×0.36-6.4×3.5.
(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.
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