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1).9a-4a+8a-14a=
2).3 (-2a+b-3c)-2(-a-3b-c)-(3a-4b-2c)=

Răspuns :

Alexandra12242003
1) 9a-4a+8a-14a=5a+8a-14a=13a-14a= -a
2) 3×(-2a+b-3c)-2×(-a-3b-c)-(3a-4b-2c)=
=-6a+3b-6c--2a-6b-2c-3a-4b-2c=
=-7a+-7b--10c

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