5:________=0.5
________:數(shù)學(xué)公式

10    
分析:設(shè)橫線要填的數(shù)是x,
(1)先根據(jù)比例基本性質(zhì):兩內(nèi)項(xiàng)之積等于兩外項(xiàng)之積,化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以0.5求解,
(2)先根據(jù)比例基本性質(zhì):兩內(nèi)項(xiàng)之積等于兩外項(xiàng)之積,化簡(jiǎn)方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以5求解.
解答:(1)設(shè)橫線要填的數(shù)是x,
5:x=0.5,
0.5x=5,
0.5x÷0.5=5÷0.5,
x=10,
答:橫線上的數(shù)是10;
(2)設(shè)橫線要填的數(shù)是x,
x:=,
5x=3,
5x÷5=5,
x=
答:橫線上的數(shù)是,
故答案為:10,
點(diǎn)評(píng):本題主要考查學(xué)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(shí)注意對(duì)齊等號(hào).
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3×1.5=2.5×4=0÷0.9=4÷0.2=
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