解:(1)5x-4.5×2=0.5,
5x-9=0.5,
5x-9+9=0.5+9,
5x=9.5,
5x÷5=9.5÷5,
x=1.9;
(2)
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:4=x:
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,
4x=
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×
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,
4x=
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,
4x=
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÷4,
x=
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;
(3)
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:x=6,
6x=
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,
6x÷6=
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÷6,
x=
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.
分析:(1)原式變?yōu)?x-9=0.5,根據(jù)等式的性質(zhì),兩邊同加上9,再同除以5即可;
(2)先根據(jù)比例的性質(zhì)改寫成4x=
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×
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,再根據(jù)等式的性質(zhì),兩邊同除以4即可;
(3)先根據(jù)比例的性質(zhì)改寫成6x=
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,再根據(jù)等式的性質(zhì),兩邊同除以6即可.
點評:此題考查了運用等式的性質(zhì)解方程,即等式兩邊同加上或同減去、同乘上或同除以一個數(shù)(0除外),兩邊仍相等,同時注意“=”上下要對齊.