解:(1)
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x÷
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=18,
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x÷
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×
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=18×
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,
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x=3,
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x×
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=3×
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,
x=4;
(2)
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x+
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x=
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,
(
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+
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)x=
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,
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x=
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,
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x×
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=
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×
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,
x=
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;
(3)(1-
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)x=
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,
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x=
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,
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x×
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=
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×
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,
x=
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.
分析:(1)根據(jù)等式的性質(zhì),兩邊同乘
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,再同乘
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即可;
(2)先根據(jù)乘法分配律改寫成(
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+
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)x=
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,即
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x=
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,再根據(jù)等式的性質(zhì),兩邊同乘
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即可;
(3)先計算1-
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=
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,再根據(jù)等式的性質(zhì),兩邊同乘
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即可.
點(diǎn)評:此題考查了根據(jù)等式的性質(zhì)解方程,即等式兩邊同加、同減、同乘或同除以一個數(shù)(0除外),等式的左右兩邊仍相等;注意等號上下要對齊.