用你喜欢的方法计算. 38.84-(23.84-9.27) 728×79+272×79 49.62+27.17-19.62 2000÷125÷8 18吨-9吨40千克+35吨60千克(用小数计算) 45×27+2680÷67 (253-195)×(72÷6) 45×[(1470-150)÷40]
第1个回答 2019-05-15
(1)38.84-(23.84-9.27)
=38.84-23.84+9.27
=15+9.27
=24.27
(2)728×79+272×79
=(728+272)×79
=1000×79
=79000
(3)49.62+27.17-19.62
=49.62-19.62+27.17
=30+27.17
=57.17
(4)2000÷125÷8
=2000÷(125×8)
=2000÷1000
=2
(5)18吨-9吨40千克+35吨60千克
=18吨-9.04吨+35.06吨
=18吨+35.06吨-9.04吨
=53.06吨-9.04吨
=44.02吨
(6)45×27+2680÷67
=1215+40
=1255
(7)(253-195)×(72÷6)
=58×12
=696
(8)45×[(1470-150)÷40]
=45×[1320÷40]
=45×33
=1485
=38.84-23.84+9.27
=15+9.27
=24.27
(2)728×79+272×79
=(728+272)×79
=1000×79
=79000
(3)49.62+27.17-19.62
=49.62-19.62+27.17
=30+27.17
=57.17
(4)2000÷125÷8
=2000÷(125×8)
=2000÷1000
=2
(5)18吨-9吨40千克+35吨60千克
=18吨-9.04吨+35.06吨
=18吨+35.06吨-9.04吨
=53.06吨-9.04吨
=44.02吨
(6)45×27+2680÷67
=1215+40
=1255
(7)(253-195)×(72÷6)
=58×12
=696
(8)45×[(1470-150)÷40]
=45×[1320÷40]
=45×33
=1485