0.75:5=(0.75×________):(5×4)15:10=(15÷10):(10÷________)10:8=20:(8+________)
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4 10 8
解析分析:根据比的基本性质作答,即比的前项和后项同时乘或除以一个数(0除外)比值不变.
解答:(1)0.75:5,
=(0.75×4):(5×4),
=3:20;
(2)15:10,
=(15÷10):(10÷10),
=(1.5×2):(1×2),
=3:2;
(3)10:8,
=20:(8+8),
=20:16,
=(20÷4):(16÷4),
=5:4.
故