用递等式计算.①7680-4680÷12×5②53×26+470×2.6③7.5÷(4-3.75)×4④57÷29×1415⑤[35+(49-13)]×45.-数学

题目简介

用递等式计算.①7680-4680÷12×5②53×26+470×2.6③7.5÷(4-3.75)×4④57÷29×1415⑤[35+(49-13)]×45.-数学

题目详情

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.
题型:解答题难度:中档来源:不详

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;

class="stub"5
7
÷class="stub"2
9
×class="stub"14
15

=class="stub"5
7
×class="stub"9
2
×class="stub"14
15

=class="stub"45
14
×class="stub"14
15

=3;

⑤[class="stub"3
5
+(class="stub"4
9
-class="stub"1
3
)]×45,
=[class="stub"3
5
+class="stub"1
9
]×45,
=class="stub"1
5
×45+class="stub"1
9
×45,
=9+5,
=14.

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