下列各题怎样算简便就怎样算.179÷8×1114×(3-125)79÷115+29×51188-7.5+12-4212445-(245+512)-数学

题目简介

下列各题怎样算简便就怎样算.179÷8×1114×(3-125)79÷115+29×51188-7.5+12-4212445-(245+512)-数学

题目详情

下列各题怎样算简便就怎样算.
1
7
9
÷8×11
1
4
×(3-1
2
5
7
9
÷
11
5
+
2
9
×
5
11
88-7.5+12-42
1
2
4
4
5
-(2
4
5
+
5
12
题型:解答题难度:中档来源:不详

答案

(1)1class="stub"7
9
÷8×11class="stub"1
4
×(3-1class="stub"2
5
),
=1class="stub"7
9
÷8×11class="stub"1
4
×1class="stub"3
5

=(class="stub"16
9
×class="stub"1
8
)×(class="stub"45
4
×class="stub"8
5
),
=class="stub"2
9
×18,
=4;

(2)class="stub"7
9
÷class="stub"11
5
+class="stub"2
9
×class="stub"5
11

=class="stub"7
9
×class="stub"5
11
+class="stub"2
9
×class="stub"5
11

=(class="stub"7
9
+class="stub"2
9
)×class="stub"5
11

=1×class="stub"5
11

=class="stub"5
11


(3)88-7.5+12-42class="stub"1
2

=(88+12)-(7.5+42.5),
=100-50,
=50;

(4)4class="stub"4
5
-(2class="stub"4
5
+class="stub"5
12
),
=4class="stub"4
5
-2class="stub"4
5
-class="stub"5
12

=2-class="stub"5
12

=1class="stub"7
12

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