题目内容
解方程.
x-
x=
x-
=
x+
×
=
.
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| 5 |
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考点:方程的解和解方程
专题:简易方程
分析:①先计算方程的左边,然后方程的两边同时乘以10即可得到未知数的值.
②方程的两边同时加上
,然后方程的两边同时乘以3即可得到未知数的值.
③先计算方程的左边,然后方程的两边同时减去
,最后方程的两边同时乘以
即可得到未知数的值.
②方程的两边同时加上
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③先计算方程的左边,然后方程的两边同时减去
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解答:
解:①
x-
x=
x-
x=
x=
x×10=
×10
x=5
②
x-
=
x+
-
=
+
x=1
x×3=1×3
x=3
③
x+
×
=
x+
=
x+
-
=
-
x=
x×
=
×
x=
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x=5
②
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x=3
③
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x=
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点评:本题考查了等式的基本性质,注意等于号要对齐.
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