计算下列各题,能用简便方法的要用简便方法计算.①486-23×16②2.5×3.2×1.25③3.5×2.6-4.5④7-45÷2-35⑤[1-(14+38)]÷14⑥24×(13+16-38)-六年

题目简介

计算下列各题,能用简便方法的要用简便方法计算.①486-23×16②2.5×3.2×1.25③3.5×2.6-4.5④7-45÷2-35⑤[1-(14+38)]÷14⑥24×(13+16-38)-六年

题目详情

计算下列各题,能用简便方法的要用简便方法计算.
①486-23×16
②2.5×3.2×1.25
③3.5×2.6-4.5
④7-
4
5
÷2-
3
5

⑤[1-(
1
4
+
3
8
)]÷
1
4

⑥24×(
1
3
+
1
6
-
3
8
题型:解答题难度:中档来源:不详

答案

①486-23×16,
=486-368,
=118;

②2.5×3.2×1.25,
=2.5×0.4×8×1.25,
=(2.5×0.4)×(8×1.25),
=1×10,
=10;

③3.5×2.6-4.5,
=9.1-4.5,
=4.6;

④7-class="stub"4
5
÷2-class="stub"3
5

=7-class="stub"2
5
-class="stub"3
5

=7-(class="stub"2
5
+class="stub"3
5
),
=7-1,
=6;

⑤[1-(class="stub"1
4
+class="stub"3
8
)]÷class="stub"1
4

=[1-class="stub"5
8
class="stub"1
4

=class="stub"3
8
÷class="stub"1
4

=class="stub"3
2


⑥24×(class="stub"1
3
+class="stub"1
6
-class="stub"3
8
),
=24×class="stub"1
3
+24×class="stub"1
6
-24×class="stub"3
8

=8+4-9,
=3.

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