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ajutaima,multumesc !

Ajutaimamultumesc class=

Răspuns :

a) 
2x
·3x +5x·x-3x²·2+x²=
6x²+5x²-6x²+x²=
6x²
b)
5a·3a-4a²·2+a·7a-3·2a²+4a²=
15a²-8a²+7a²-6a²+4a²=
7a²+7a²-6a²+4a²=
14a²-6a²+4a²=
12a²
c)
2x²·x-3x³+4x·5x·x-3·2x³+x³·(-2)=
2x³-3x³+20x³-6x³-2x³=
11x³
d)
(7ab)·(-2ab)-5a²·3b²+3a·10ab²=
-14a²b²-15a²b²+30a²b²=
-29a²b²+30a²b²=
a²b²
sper ca te-am ajutat