解:(1)0.15:0.18=6
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:x,
0.15x=0.18×6
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,
0.15x=1.17,
0.15x÷0.15=1.17÷0.15,
x=7.8;
(2)
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×(x+5)=2.5,
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×(x+5)
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=2.5
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,
x+5=10,
x+5-5=10-5,
x=5;
(3)160-x+32=46,
192-x+x=46+x,
192-46=46+x-46,
x=146;
(4)14.6+5x=29.6,
14.6+5x-14.6=29.6-14.6,
5x=15,
5x÷5=15÷5,
x=3.
分析:(1)根據(jù)比例基本性質(zhì),兩內(nèi)項之積等于兩外項之積,化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時除以0.15求解;
(2)依據(jù)等式的性質(zhì),方程兩邊同時除以
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,再同時減5求解;
(3)先化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時加x,最后同時減46求解;
(4)依據(jù)等式的性質(zhì),方程兩邊同時減14.6,再同時除以5求解.
點評:本題主要考查學生依據(jù)等式的性質(zhì),以及比例基本性質(zhì)解方程的能力,解方程時注意對齊等號.