问题 解答题
用递等式计算.
①7680-4680÷12×5
②53×26+470×2.6③7.5÷(4-3.75)×4
5
7
÷
2
9
×
14
15
⑤[
3
5
+(
4
9
-
1
3
)]×45.
答案

①7680-4680÷12×5,

=7680-390×5,

=7680-1950,

=5730;

②53×26+470×2.6,

=530×2.6+470×2.6,

=(530+470)×2.6,

=1000×2.6,

=2600;

③7.5÷(4-3.75)×4,

=7.5÷0.25×4,

=30×4,

=120;

5
7
÷
2
9
×
14
15

=

5
7
×
9
2
×
14
15

=

45
14
×
14
15

=3;

⑤[

3
5
+(
4
9
-
1
3
)]×45,

=[

3
5
+
1
9
]×45,

=

1
5
×45+
1
9
×45,

=9+5,

=14.

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