脱式计算.(21+25)×573-23×1021-278×56+25÷4.-数学

题目简介

脱式计算.(21+25)×573-23×1021-278×56+25÷4.-数学

题目详情

脱式计算.
(21+
2
5
)×
5
7

3-
2
3
×
10
21
-
2
7

5
6
+
2
5
÷4.
题型:解答题难度:中档来源:不详

答案

(1)(21+class="stub"2
5
)×class="stub"5
7

=21×class="stub"5
7
+class="stub"2
5
×class="stub"5
7

=15+class="stub"2
7

=15class="stub"2
7

(2)3-class="stub"2
3
×class="stub"10
21
-class="stub"2
7

=3-class="stub"20
63
-class="stub"2
7

=3-(class="stub"20
63
+class="stub"18
63
),
=2class="stub"25
63

(3)8×class="stub"5
6
+class="stub"2
5
÷4,
=8×class="stub"5
6
+class="stub"2
5
×class="stub"1
4

=class="stub"20
3
+class="stub"1
10

=6class="stub"23
30

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