1: 51 510 5100
1.8 18 180
2: 4.8 4.4 12.5
3: 180 0.015
12 17.5
4: 96÷1.5=64
5: ⑴ 12÷0.5--9÷1.5
=24--6
=18
⑵ (12÷0.5﹚÷﹙9÷1.5﹚
=24÷6
=4
6: 1.8÷﹙0.075×100)
=1.8÷7.5
=0.24
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