计算下列各题.(1)78-56×910(2)25×49+25×59(3)(23+18)×(12-919)(4)57×[1-(14+25)].-数学

题目简介

计算下列各题.(1)78-56×910(2)25×49+25×59(3)(23+18)×(12-919)(4)57×[1-(14+25)].-数学

题目详情

计算下列各题.
(1)
7
8
-
5
6
×
9
10

(2)
2
5
×
4
9
+
2
5
×
5
9

(3)(
2
3
+
1
8
)×(
1
2
-
9
19

(4)
5
7
×[1-(
1
4
+
2
5
)].
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
8
-class="stub"5
6
×class="stub"9
10

=class="stub"7
8
-class="stub"3
4

=class="stub"1
8


(2)class="stub"2
5
×class="stub"4
9
+class="stub"2
5
×class="stub"5
9

=class="stub"2
5
×(class="stub"4
9
+class="stub"5
9
),
=class="stub"2
5
×1,
=class="stub"2
5


(3)(class="stub"2
3
+class="stub"1
8
)×(class="stub"1
2
-class="stub"9
19
),
=class="stub"19
24
×class="stub"1
38

=class="stub"1
48


(4)class="stub"5
7
×[1-(class="stub"1
4
+class="stub"2
5
)],
=class="stub"5
7
×[1-class="stub"13
20
],
=class="stub"5
7
×class="stub"7
20

=class="stub"1
4

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