Question

6．

脱式计算． 4÷0.5×2.5	4.5÷1.25×8	64-2.64×0.5
0.8×3.27×7.5	6.28×7.2÷0.28×62.8	40.5÷0.5+10.75．

Answer 1

分析 ①先算除法，再算乘法，
②先算除法，再算乘法，
③先算乘法，再算减法，
④从左依次计算乘法，
⑤先算乘法，再算除法，最后算乘法，
先算除法，再算加法．

解答 解：①4÷0.5×2.5
=8×20
=160

②4.5÷1.25×8
=3.6×8
=28.8

③64-2.64×0.5
=64-1.32
=62.68

④0.8×3.27×7.5   
=2.616×7.5
=19.62  

⑤6.28×7.2÷0.28×62.8
=45.216÷0.28×62.8
=161.4857142857×62.8
=10141.302857142 

⑥40.5÷0.5+10.75
=81+10.75
=91.75

点评 此题考查小数四则混合运算顺序，分析数据找到正确的计算方法．