题目内容
解方程.
|
|
ⅹ÷
| ||||||||||
|
1.5x=2.25 | x÷
|
分析:(1)依据等式的性质,方程两边同时除以
求解,
(2)依据等式的性质,方程两边同时除以
求解,
(3)依据等式的性质,方程两边同时乘
求解,
(4)依据等式的性质,方程两边同时除以
求解,
(5)依据等式的性质,方程两边同时除以1.5求解,
(6)依据等式的性质,方程两边同时乘
求解.
| 1 |
| 3 |
(2)依据等式的性质,方程两边同时除以
| 4 |
| 5 |
(3)依据等式的性质,方程两边同时乘
| 11 |
| 8 |
(4)依据等式的性质,方程两边同时除以
| 7 |
| 10 |
(5)依据等式的性质,方程两边同时除以1.5求解,
(6)依据等式的性质,方程两边同时乘
| 5 |
| 8 |
解答:解:(1)
ⅹ=6,
ⅹ÷
=6÷
,
x=18;
(2)
ⅹ=
,
ⅹ÷
=
÷
,
x=1
;
(3)ⅹ÷
=
,
ⅹ÷
×
=
×
,
x=
;
(4)
x=
,
x÷
=
÷
,
x=1
;
(5)1.5x=2.25,
1.5x÷1.5=2.25÷1.5,
x=1.5;
(6)x÷
=
,
x÷
×
=
×
,
x=
.
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=18;
(2)
| 4 |
| 5 |
| 16 |
| 15 |
| 4 |
| 5 |
| 4 |
| 5 |
| 16 |
| 15 |
| 4 |
| 5 |
x=1
| 1 |
| 3 |
(3)ⅹ÷
| 11 |
| 8 |
| 16 |
| 33 |
ⅹ÷
| 11 |
| 8 |
| 11 |
| 8 |
| 16 |
| 33 |
| 11 |
| 8 |
x=
| 2 |
| 3 |
(4)
| 7 |
| 10 |
| 4 |
| 3 |
| 7 |
| 10 |
| 7 |
| 10 |
| 4 |
| 3 |
| 7 |
| 10 |
x=1
| 19 |
| 21 |
(5)1.5x=2.25,
1.5x÷1.5=2.25÷1.5,
x=1.5;
(6)x÷
| 5 |
| 8 |
| 10 |
| 17 |
x÷
| 5 |
| 8 |
| 5 |
| 8 |
| 10 |
| 17 |
| 5 |
| 8 |
x=
| 25 |
| 68 |
点评:本题主要考查学生依据等式的性质解方程的能力,解方程时注意对齐等号.
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