题目内容
| 14.4:x=18:5 |
|
| ||||||||
|
0.8:x=
|
49:(5+x)=14:2 | ||||||||
|
x:1.6=12:
|
分析:先根据比例的性质,把原式转化为乘积的形式,再根据等式的性质,解方程即可求解.
解答:解:(1)14.4:x=18:5,
18x=14.4×5,
18x=72,
x=4;
(2)
=
,
0.4x=0.5×0.6,
0.4x=0.3,
x=0.75;
(3)
=
,
9x=9.6×0.6,
9x=5.76,
x=0.64;
(4)
=
,
0.7x=35×21,
0.7x=735,
x=1050;
(5)0.8:x=
:0.75,
0.6x=0.8×0.75,
0.6x=0.6,
x=1;
(6)49:(5+x)=14:2,
x=
×
,
x=
,
x=
.
18x=14.4×5,
18x=72,
x=4;
(2)
| 0.5 |
| 0.4 |
| x |
| 0.6 |
0.4x=0.5×0.6,
0.4x=0.3,
x=0.75;
(3)
| 9.6 |
| x |
| 9 |
| 0.6 |
9x=9.6×0.6,
9x=5.76,
x=0.64;
(4)
| 35 |
| 0.7 |
| x |
| 21 |
0.7x=35×21,
0.7x=735,
x=1050;
(5)0.8:x=
| 3 |
| 5 |
0.6x=0.8×0.75,
0.6x=0.6,
x=1;
(6)49:(5+x)=14:2,
| 14(5+x)=49×2, 14(5+x)=98, 5+x=7, x=2; (7)x:1.6=12:
|
||||||
| 0.8x=1.6×12, 0.8x=19.2, x=24; |
||||||
(8)
|
| 3 |
| 4 |
| 5 |
| 6 |
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
x=
| 4 |
| 9 |
点评:本题考查了学生利用比例的基本性质和等式的性质解方程的能力,注意等号要对齐.
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