这六题怎么做? 255
5个回答
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3、
(1)、56.89-23.47+16.53
=56+0.89-23-0.47+16+0.53
=56-23+16+0.89-0.47+0.53
=49+0.95
=49.95
(2)、37.42-(27.42+5.6)-4.4
=37.42-27.42-5.6-4.4
=10-10
=0
(3)、(25x62-62x25)÷18
=0÷18
=0
(4)、37800÷[15x(272÷16)-234]
=37800÷[15x17-234]
=37800÷[255-234]
=37800÷21
=1800
4、
(1)、(5+5)÷(84+16)
=10÷100
=0.1
(2)、12.8+(12.8+0.4)÷10
=12.8+13.2÷10
=12.8+1.32
=14.12
(1)、56.89-23.47+16.53
=56+0.89-23-0.47+16+0.53
=56-23+16+0.89-0.47+0.53
=49+0.95
=49.95
(2)、37.42-(27.42+5.6)-4.4
=37.42-27.42-5.6-4.4
=10-10
=0
(3)、(25x62-62x25)÷18
=0÷18
=0
(4)、37800÷[15x(272÷16)-234]
=37800÷[15x17-234]
=37800÷[255-234]
=37800÷21
=1800
4、
(1)、(5+5)÷(84+16)
=10÷100
=0.1
(2)、12.8+(12.8+0.4)÷10
=12.8+13.2÷10
=12.8+1.32
=14.12
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