(1)(16.1-15.3)×16×2.4(2)1÷(87-12)×127(3)(2113×1342+23)÷(11-53)(4)128×41.5-1.5×128-40÷1428(5)289的314除

题目简介

(1)(16.1-15.3)×16×2.4(2)1÷(87-12)×127(3)(2113×1342+23)÷(11-53)(4)128×41.5-1.5×128-40÷1428(5)289的314除

题目详情

(1)(16.1-15.3)×
1
6
×2.4

(2)1÷(
8
7
-
1
2
)×1
2
7

(3)(
21
13
×
13
42
+
2
3
)÷(11-
5
3

(4)128×41.5-1.5×128-40÷
1
428

(5)
28
9
3
14
除以1.85与
1
4
的差,商是多少?
(6)一个数的40%比它的3倍少10,求这个数.
题型:解答题难度:中档来源:不详

答案

(1)(16.1-15.3)×class="stub"1
6
×2.4

=0.8×0.4,
=0.32;

(2)1÷(class="stub"8
7
-class="stub"1
2
)×1class="stub"2
7

=1÷(class="stub"16
14
-class="stub"7
14
)×class="stub"9
7

=1÷class="stub"9
14
×class="stub"9
7

=class="stub"14
9
×class="stub"9
7

=2;

(3)(class="stub"21
13
×class="stub"13
42
+class="stub"2
3
)÷(11-class="stub"5
3
),
=(class="stub"1
2
+class="stub"2
3
)÷class="stub"28
3

=class="stub"7
6
×class="stub"3
28

=class="stub"1
8


(4)128×41.5-1.5×128-40÷class="stub"1
428

=128×(41.5-1.5)-40×428,
=40×(128-428),
=40×(-300),
=-12000;

(4)class="stub"28
9
×class="stub"3
14
÷(1.85-class="stub"1
4
),
=class="stub"1
6
÷class="stub"8
5

=class="stub"1
6
×class="stub"5
8

=class="stub"5
48

答;class="stub"28
9
class="stub"3
14
除以1.85与class="stub"1
4
的差,商是class="stub"5
48


(5)设这个数是x.
3x-40%x=10,
class="stub"26
10
x=10,
class="stub"26
10
class="stub"10
26
=10×class="stub"10
26

x=class="stub"50
13

x=3class="stub"11
13

答:这个数是3class="stub"11
13

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