Question

算一算．

21.36÷0.8-12.9	7.28+3.2÷2.5	5.6×13-3×5.6
10.8×0.8÷0.27	[48-（2.48-1.28）]÷1.2	0.125×[（2.8+6.8）÷2.4]．

Answer 1

（1）21.36÷0.8-12.9 =26.7-12.9 =13.8；

（2）7.28+3.2÷2.5
=7.28+1.28
=8.56；

（3）5.6×13-3×5.6
=5.6×（13-3）
=5.6×10
=56；

（4）10.8×0.8÷0.27
=8.64÷0.27
=32；

（5）[48-（2.48-1.28）]÷1.2
=[48-1.2]÷1.2
=46.8÷1.2
=39；

（6）0.125×[（2.8+6.8）÷2.4]
=0.125×[9.6÷2.4]
=0.125×4
=0.5．