Question

16．脫式計(jì)算．

10.8÷[（4.62-1.92）×4]	1.8×25+24÷1.5	0.36÷[（6.1-4.6 ）×0.8]
（10-10.8÷1.5）×5.7	4.5×1.2-3.15÷15	0.175÷0.25÷0.4．

Answer 1

分析 ①再算小括號(hào)里面的算式，再算中括號(hào)里面的算式，最后算中括號(hào)外面的算式．
②先算乘除法再算加法．
③再算小括號(hào)里面的算式，再算中括號(hào)里面的算式，最后算中括號(hào)外面的算式．
④再算小括號(hào)里面的算式，再算小括號(hào)外面的算式．
⑤先算乘除法再算減法．
⑥用連除的性質(zhì)計(jì)算即可，a÷b÷c=a÷（b×c）．

解答 解：①10.8÷[（4.62-1.92）×4]
=10.8÷[（2.7×4]
=10.8÷10.8
=1

②1.8×25+24÷1.5
=45+16
=61

③0.36÷[（6.1-4.6 ）×0.8]
=0.36÷[1.5×0.8]
=0.36÷1.2
=0.3

④（10-10.8÷1.5）×5.7
=（10-7.2）×5.7
=2.8×5.7
=15.96

⑤4.5×1.2-3.15÷15
=5.4-0.21
=5.19

⑥0.175÷0.25÷0.4
=0.175÷（0.25×0.4）
=0.175÷0.1
=1.75

點(diǎn)評(píng) 此題考查了學(xué)生對(duì)小數(shù)四則混合運(yùn)算題的計(jì)算能力．