Question

verify:(x+y)+z=x+(y+z) :x=-2,y=3/5,z=-4/3

Answer 1

Answer:

(_2+3/5)+(-4/3)=_2+(3/5+(_4/3))

(_2×5+3×1/5)+(_4/3)=-2+(3×3_4×5/15)

(_10+3/5)+(-4/3)=-2+(9_20/15)

_7/5_4/3=-2+(-11/15)

-7×3-4×5/15=-2×15-11×1/15

-21-20/15=30_11/15

_41/15=19/15

-41+19/15

-22/15

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