(1+3/4-7/8-7/12)*(-24)要过程还有6.868*(-5)+6.868*(-12+6.868)*(+17)错啦错啦。。第二题是6.868*(-5)+6.868*(-12)+6.868*(+17)

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(1+3/4-7/8-7/12)*(-24)要过程还有6.868*(-5)+6.868*(-12+6.868)*(+17)错啦错啦。。第二题是6.868*(-5)+6.868*(-12)+6.868*(+17)
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(1+3/4-7/8-7/12)*(-24)要过程还有6.868*(-5)+6.868*(-12+6.868)*(+17)错啦错啦。。第二题是6.868*(-5)+6.868*(-12)+6.868*(+17)
(1+3/4-7/8-7/12)*(-24)要过程
还有6.868*(-5)+6.868*(-12+6.868)*(+17)
错啦错啦。。第二题是6.868*(-5)+6.868*(-12)+6.868*(+17)

(1+3/4-7/8-7/12)*(-24)要过程还有6.868*(-5)+6.868*(-12+6.868)*(+17)错啦错啦。。第二题是6.868*(-5)+6.868*(-12)+6.868*(+17)
(1+3/4-7/8-7/12)*(-24)
=-24-18+21+14
=-7
6.868*(-5)+6.868*(-12)+6.868)*(+17)
=6.868*(-5-12+17)
=0

(7&#47;4-7&#47;8-7&#47;12)&#47;(-7&#47;8)+(-8&#47;3)=(要过程)原式=(7&#47;4-7&#47;8-7&#47;12)&#47;(-7&#47;8)+(-8&#47;3)           =((7*6-7*3-7*2)&#47;24)&#47;(-7&#47;8)+(-8&#47;3)           =(7&#47;24)*(-8&...

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(7&#47;4-7&#47;8-7&#47;12)&#47;(-7&#47;8)+(-8&#47;3)=(要过程)原式=(7&#47;4-7&#47;8-7&#47;12)&#47;(-7&#47;8)+(-8&#47;3)           =((7*6-7*3-7*2)&#47;24)&#47;(-7&#47;8)+(-8&#47;3)           =(7&#47;24)*(-8&#47;7)-8&#47;3           =-8&#47;24-8&#47;3           =-9&#47;3           =-3

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