解比例(我做的最仔细).
x:14=6:28????????????????
=
:=x:.
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解:(1)x:14=6:28,
?????????? 28x=14×6,
?????? 28x÷28=84÷28,
???????????? x=3;
(2)=,
???? ?0.25x=0.75×3,
0.25x÷0.25=2.25÷0.25,
????????? x=9;
(3):=x:,
??????? x=×,
??? x÷=÷,
????????? x=1.
解析分析:先根据比例基本性质化简,再依据等式性质:(1)两边同时除以28求解,(2)两边同时除以0.25求解,(3)两边同时除以求解.
点评:本题主要考查了学生依据等式性质解比例知识掌握.