17.3. ABCDA,B,C,D, кубындағы АВС
және CDA, жазықтықтарының
арасындағы бұрышты табыңдар.
114
356
Ответы на вопрос:
1) -7 1/3+6 7/8: (-5 1/4)+4 21/40: 1 9/20=-6 1013/1218 по действиям 1)6 7/8: (-5 1/4)=-6 7/8: 5 1/4=-55/8: 21/4=-55/8*4/21= =-55/2*1/21=-55/21=-2 13/21 2)4 21/40: 1 9/20=181/40: 29/20=181/40*20/29=181/2*1/29=181/58=3 7/58 3)-7 1/3-2 13/21=-7 7/21-2 13/21=-9 20/21 4)-9 20/21+3 7/58=-9 1160/1218+3 147/1218=-6 1013/1218 2)- 6 1/7+5 3/4: 11/ 3/4+1 5/6): 1/6= по действиям 1)-3 3/4+1 5/6=-3 9/12+1 10/12=-1 11/12=-23/12 2)-23/12: 1/6=-23/12*6/1=-23/2=-11 1/2 3)5 3/4: 11/14=23/4*14/11=23/2*7/11=161/22=7 7/22 4)- 6 1/7+7 7/22=- 6 22/154+7 49/154=1 27/154 5)1 27/ 1/2)=1 27/154+11 1/2=1 27/154+11 77/154=12 104/154= =12 52/77
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