(1)0.625:0.375                    
(2)480千克:1.2噸                   
(3)數(shù)學(xué)公式數(shù)學(xué)公式

解:(1)0.625:0.375=(0.625×1000):(0.375×1000)
=625:375
=(625÷125):(375÷125)
=5:3
   (2)480千克:1.2噸=480千克:1200千克
=480:1200
=(480÷240):(1200÷240)
=2:5
   (3)=(×21):(×21)
=18:9
=2:1
故答案是5:3,2:5,2:1.
分析:根據(jù)比的性質(zhì)“比的前項(xiàng)和后項(xiàng)同時(shí)乘或除以相同的數(shù)(0除外),比值不變.”把本題化成最簡(jiǎn)整數(shù)比,在解答第二題時(shí),首先要把單位統(tǒng)一再化簡(jiǎn).
點(diǎn)評(píng):化簡(jiǎn)整數(shù)比最后答案是一個(gè)比,而求比值最后的答案是一個(gè)比值,這個(gè)比值可以是分?jǐn)?shù),小數(shù)或整數(shù).
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