a)
31x²-9+4x²-3²=35x²-9-9=35x²-18
c)
3√2-4x+5√2+4x=8√2
e)
12-3x²+ax-7+x²+5ax+9+6x²=3x²+6ax+14
g)
100+(a²b-3b²)+49+8b²-(a²b-10b²)=100+a²b-3b²+49+8b²-a²b+10b²=149+15b²
Răspuns:
Explicație pas cu pas:
A
31x²-9+4x²-3²= 35x²- 18
C
3√2 - 4x + 5√2 + 4x =8√2
Е
12 - 3x² + ax -7 +x² +5ax +9 +6x² = 4x² +6ax +4 = 2·(2x² +3ax +2)
G
100+(a²b-3b²)+49+8b²-(a²b-10b²)=
= 149+15b²
