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repedee va rog dau coroana

Repedee Va Rog Dau Coroana class=

Răspuns :

5)(4x-3)²-(3x-2)²+(2x+5)²=16x²-24x+9-(9x²-12x+4)+4x²+20x+25=
16x²-24x+9-9x²+12x-4+4x²+20x+25=11x²+8x+30

6)x-2y=6
x²-4y²=24
(x-2y)(x+2y)=24
6·(x+2y)=24
x+2y=4
a=x+2y+(x+2y)²+(x+2y)³+(x+2y)⁴=4+4²+4³+4⁴=340