解比例.(1)8:x=12:4(2)x2.5=184.5(3)56:23=18:x(4)0.16:45=x:15.-数学

题目简介

解比例.(1)8:x=12:4(2)x2.5=184.5(3)56:23=18:x(4)0.16:45=x:15.-数学

题目详情

解比例.
(1)8:x=12:4
(2)
x
2.5
=
18
4.5

(3)
5
6
2
3
=
1
8
:x
(4)0.16:
4
5
=x:15.
题型:解答题难度:中档来源:不详

答案

(1)8:x=12:4,
12x=8×4,
12x÷12=32÷12,
x=class="stub"8
3


(2)class="stub"x
2.5
=class="stub"18
4.5

4.5x=2.5×18,
4.5x÷4.5=45÷4.5,
x=10;

(3)class="stub"5
6
class="stub"2
3
=class="stub"1
8
:x,
class="stub"5
6
x=class="stub"2
3
×class="stub"1
8

class="stub"5
6
x÷class="stub"5
6
=class="stub"1
12
÷class="stub"5
6

x=class="stub"1
10


(4)0.16:class="stub"4
5
=x:15,
class="stub"4
5
x=0.16×15,
class="stub"4
5
x÷class="stub"4
5
=2.4÷class="stub"4
5

x=3.

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