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7. efectuati calculele
a) [
2
-1 x+3 x+1 2x+3
x+1 x+4
6x-12x+2x+3 (3x+5
b)
3x+10x-2 x+1
x+2
x²+x-2
2x+5
c)
x+3 x+1
1
5x+5
x+3
x-2
x+2x²-4
x²-3x+2
d)
3x+5
x²+5x+4x-3
9x²-4
-2
x+1 x +5 +6 x-2