| 5:x=3:9 | =![]() |
x: =4:![]() | 36:18=x:5.4 |
=![]() | 1: =x:![]() |
: =x:![]() | : = :x |
=![]() | :x= :![]() |
: =x:![]() | =1.5:4 |
| X:1.5=25% | =0.6 |
![]() | x:![]() |
3x=5×9,
3x÷3=45÷3,
x=15;
(2)
=
,4x=54×5,
4x÷4=270÷4,
x=67.5;
(3)x:
=4:
,
x=
×4,
x
=1
,x=
;(4)36:18=x:5.4,
18x=36×5.4,
18x÷18=194.4÷18,
x=10.8;
(5)
=
,1.5x=6×10,
1.5x÷1.5=60÷1.5,
x=40;
(6)1:
=x:
,
x=1×
,
x
=
,x=
;(7)
:
=x:
,
x=
×
,
x
=
,x=
;(8)
:
=
:x,
x=
×
,
x
=
,x=
;(9)
=
,2x=12×7,
2x÷2=84÷2,
x=42;
(10)
:x=
:
,
x=
×
,
x
=
,x=
;(11)
:
=x:
,
x=
×
,
x
=
,x=
;(12)
=1.5:4,4x=1.5×0.8,
4x÷4=1.2÷4,
x=0.3;
(13)X:1.5=25%,
X=1.5×25%,
X=0.375;
(14)
=0.6,x=13×0.6,
x=7.8;
(15)
=
,2x=2.5×25,
2x÷2=62.5÷2,
x=31.25;
(16)x:
,x=
×
,x=
.分析:根据比例基本性质:两内项之积等于两外项之积,化简方程,再依据等式的性质求解即可.
点评:本题主要考查了学生根据等式的性质和比例的基本性质解方程的能力,注意等号对齐.
=