解比例.
①???????? ②0.75:=12:x?????????③:=x:
④4:4.5=?????????⑤:=x:9?????????????⑥6.5:x=3.25:4.
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解:①,
?????? 14x=0.7×5,
?? 14x÷14=3.5÷4,
???????? x=0.25;
②0.75:=12:x,
????? 0.75x=×12,
0.75x÷0.75=6÷0.75,
??????????x=8;
③:=x:,
?????x=×,
? x=,
????? x=;
④4:4.5=,
?4.5×=4,
?? x=4÷,
?????? x=24;
⑤:=x:9,
????x=×9,
? x=6,
????? x=;
⑥6.5:x=3.25:4.
???? ?3.25x=6.5×4,
3.25x÷3.25=26÷3.25,
????????? x=8.
解析分析:根据比例的基本性质,两内项之积等于两外项之积,把原式改写,然后再根据等式性质进行求解即可.
点评:本题主要考查解比例,根据比例的基本性质和等式的性质进行解答即可.