计算下列各题.(能简算的要简算)7÷79-79÷7=15÷89+15×78=322÷[54÷(143-12)]3-518×2740-1316=79×9+791913÷75-613×57=-数学

题目简介

计算下列各题.(能简算的要简算)7÷79-79÷7=15÷89+15×78=322÷[54÷(143-12)]3-518×2740-1316=79×9+791913÷75-613×57=-数学

题目详情

计算下列各题.(能简算的要简算)
7
9
-
7
9
÷7=
15÷
8
9
+15×
7
8
=
3
22
÷[
5
4
÷(
14
3
-
1
2
)]
3-
5
18
×
27
40
-
13
16
=
7
9
×9+
7
9
19
13
÷
7
5
-
6
13
×
5
7
=
题型:解答题难度:中档来源:不详

答案

(1)7÷class="stub"7
9
-class="stub"7
9
÷7
=7×class="stub"9
7
-class="stub"7
9
×class="stub"1
7

=9-class="stub"1
9

=8class="stub"8
9


(2)15÷class="stub"8
9
+15×class="stub"7
8

=15×class="stub"9
8
+15×class="stub"7
8

=15×(class="stub"9
8
+class="stub"7
8
),
=15×2,
=30;

(3)class="stub"3
22
÷[class="stub"5
4
÷(class="stub"14
3
-class="stub"1
2
)]
=class="stub"3
22
÷[class="stub"5
4
÷class="stub"25
6
],
=class="stub"3
22
÷[class="stub"5
4
×class="stub"6
25
],
=class="stub"3
22
÷class="stub"3
10

=class="stub"3
22
×class="stub"10
3

=class="stub"5
11


(4)3-class="stub"5
18
×class="stub"27
40
-class="stub"13
16

=3-class="stub"3
16
-class="stub"13
16

=3-(class="stub"3
16
+class="stub"13
16
),
=3-1,
=2;

(5)class="stub"7
9
×9+class="stub"7
9

=7+class="stub"7
9

=7class="stub"7
9


(6)class="stub"19
13
÷class="stub"7
5
-class="stub"6
13
×class="stub"5
7

=class="stub"19
13
×class="stub"5
7
-class="stub"6
13
×class="stub"5
7

=(class="stub"19
13
-class="stub"6
13
)×class="stub"5
7

=1×class="stub"5
7

=class="stub"5
7

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