问题 解答题
用简便方法计算.  
4
15
×0.35+0.65÷
15
4

②10.69-2.5×2.4.
答案

4
15
×0.35+0.65÷
15
4

=

4
15
×0.35+0.65×
4
15

=(0.35+0.65)×

4
15

=1×

4
15

=

4
15

②10.69-2.5×2.4

=10.69-2.5×0.4×6,

=10.69-1×6,

=10.69-6,

=4.69.

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