3a+5b-4a-2b при a=5,3 и b=1/3

Question

3a+5b-4a-2b при a=5,3 и b=1/3

Answer 1

.....….……......................

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Answer 2

3*5,3+5*1/3-4*5,3-2*1/3=
=15,9+5/3-21,2-2/3=
=!59/10+5/3-212/10-2/3=
=477/30+50/30-636/30-20/30=
=-129/30=-4 9/30=-4 33/10=-4,3