计算下面各题,能简算的要简算.175×718×7598×969742×(1914-821)7×9(67-19)710×99+71049×316+512.-数学

题目简介

计算下面各题,能简算的要简算.175×718×7598×969742×(1914-821)7×9(67-19)710×99+71049×316+512.-数学

题目详情

计算下面各题,能简算的要简算.
1
75
×
7
18
×75
98×
96
97
42×(
19
14
-
8
21
7×9(
6
7
-
1
9
7
10
×99+
7
10
4
9
×
3
16
+
5
12
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
75
×class="stub"7
18
×75,
=class="stub"1
75
×75×class="stub"7
18

=class="stub"7
18


(2)98×class="stub"96
97

=(97+1)×class="stub"96
97

=97×class="stub"96
97
+1×class="stub"96
97

=1+class="stub"96
97

=1class="stub"96
97


(3)42×(class="stub"19
14
-class="stub"8
21
),
=42×class="stub"19
14
-42×class="stub"8
21

=57-16,
=41;

(4)7×9×(class="stub"6
7
-class="stub"1
9
),
=7×9×class="stub"6
7
-7×9×class="stub"1
9

=54-7,
=47;

(5)class="stub"7
10
×99+class="stub"7
10

=class="stub"7
10
×(99+1),
=class="stub"7
10
×100,
=70;

(6)class="stub"4
9
×class="stub"3
16
+class="stub"5
12

=class="stub"1
12
+class="stub"5
12

=class="stub"1
2

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