计算下面各题.(1)递等式计算:37÷(116+23)×103(2)解方程:45×(x+50%)=16(3)简便计算:78×(1-75%)+14+0.25×1849.5×13.5+50.5×13-0.

题目简介

计算下面各题.(1)递等式计算:37÷(116+23)×103(2)解方程:45×(x+50%)=16(3)简便计算:78×(1-75%)+14+0.25×1849.5×13.5+50.5×13-0.

题目详情

计算下面各题.
(1)递等式计算:
3
7
÷(
11
6
+
2
3
10
3

(2)解方程:
4
5
×(x+50%)=16
(3)简便计算:
7
8
×(1-75%)+
1
4
+0.25×
1
8

49.5×13.5+50.5×13-0.5×49.5.
题型:解答题难度:中档来源:不详

答案


(1)class="stub"3
7
÷(class="stub"11
6
+class="stub"2
3
)×class="stub"10
3

=class="stub"3
7
÷class="stub"5
2
×class="stub"10
3

=class="stub"6
35
×class="stub"10
3

=class="stub"4
7


(2)class="stub"4
5
×(x+50%)=16,
class="stub"4
5
×(x+50%)÷class="stub"4
5
=16÷class="stub"4
5

x+50%=20,
x+50%-50%=20-50%,
x=19.5;

(3)class="stub"7
8
×(1-75%)+class="stub"1
4
+0.25×class="stub"1
8

=class="stub"7
8
×0.25+0.25+0.25×class="stub"1
8

=(class="stub"7
8
+1+class="stub"1
8
)×0.25,
=2×0.25,
=0.5;

49.5×13.5+50.5×13-0.5×49.5,
=49.5×13.5-0.5×49.5+50.5×13,
=49.5×(13.5-0.5)+50.5×13,
=49.5×13+50.5×13,
=(49.5+50.5)×13,
=100×13,
=1300.

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