30分,先做再加,选个好的,①0-(-10)②-0.257-4.47③2分之7-(+3又6分之5)④(-3)-(-9)

问题描述:

30分,先做再加,选个好的,
①0-(-10)
②-0.257-4.47
③2分之7-(+3又6分之5)
④(-3)-(-9)

①0-(-10)=10
②-0.257-4.47=-4.727
③2分之7-(+3又6分之5)=-3分之1
④(-3)-(-9)=6

1. 0-(-10)
=0+10
=10
2.-0.257-4.47
=-(0.257+4.47)
=-4.727
3.7/2-3又5/6
=7/2-23/5
=57/10-46/10
=11/10
4.(-3)-(-9)
=-3+9
=6

10
-4.727
21/6+23/6=44/6=22/3
6

(1)0+10=10
(2)-0.257-4.47=-4.727
(3)1/3
(4)-3+9=6

①0-(-10)
=0+10
=10
②-0.257-4.47
=-4.727
③2分之7-(+3又6分之5)
=(7/2)-(23/6)
=(21/6)-(23/6)
=-2/6
=-1/3
④(-3)-(-9)
=-3+9
=9-3
=6