题目内容
解方程.
X+
X=500
a+
=
8.65+
-a+
=0.
X+
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8.65+
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| 6 |
分析:x+
x=500先把方程的左边合并成一项,再根据等式的基本性质解答;
a+
=
先方程的两边同时减去
,再两边同时除以
即可求得未知数的值;
8.65+
-a
=0先把方程左边进行合并,再根据等式进行解答,即可求得未知数的值.
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8.65+
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解答:解:x+
x=500
x=500,
x=500×
,
x=
;
a+
=
a=
-
,
a=
,
a=1;
8.65+
-a+
=0
8.65+
+
-a=0,
8.65+0.5-a=0,
a=9.15.
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x=500×
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x=
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a=1;
8.65+
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8.65+
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8.65+0.5-a=0,
a=9.15.
点评:主要考查了等式的基本性质.
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