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Calculați:
1. (-1/2)+(-2/3)-(-5/6)=
2.(-3/14)×(-4/21)=
3.(-4/15):(+6/5)=
4.(-3/14+8/21-9/28):(-2/21)=

Răspuns :

Ignatovvlad201
1) -1/2-2/3+5/6= -3-4+5 totu supra6=-2/6=-1/3,  2) 3/14×1/3=1/14, 3)   -4/15×5/6=-2/3×1/3=-2/9, 4) -18+32-27totu supra 84÷(-2/21)=(-13/84)÷(-2/21)=13/84×21/2=13/4×1/2=13/8,,,,,sp. aj.