计算:(1)49×1516÷56(2)12:15=14:x(3)1920+0.25+5%+34(4)解方程1112x-x120%=65.-数学

题目简介

计算:(1)49×1516÷56(2)12:15=14:x(3)1920+0.25+5%+34(4)解方程1112x-x120%=65.-数学

题目详情

计算:
(1)
4
9
×
15
16
÷
5
6
(2)
1
2
1
5
=
1
4
:x
(3)
19
20
+0.25+5%+
3
4
(4)解方程
11
12
x-
x
120%
=65.
题型:解答题难度:中档来源:不详

答案

(1)class="stub"4
9
×class="stub"15
16
÷class="stub"5
6

=class="stub"5
12
÷class="stub"5
6

=class="stub"1
2


(2)class="stub"1
2
:class="stub"1
5
=class="stub"1
4
:x
class="stub"1
2
x=class="stub"1
5
×class="stub"1
4

class="stub"1
2
x÷class="stub"1
2
=class="stub"1
20
÷class="stub"1
2

x=class="stub"1
10


(3)class="stub"19
20
+0.25+5%+class="stub"3
4

=(class="stub"19
20
+5%)+(0.25+class="stub"3
4

=1+1
=2;

(4)class="stub"11
12
x-class="stub"x
120%
=65
class="stub"1
12
x=65
class="stub"1
12
x÷class="stub"1
12
=65÷class="stub"1
12

x=780.

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