Question

×^2 minus (×^2+5× minus 1) + 5×=?

minus (× minus 1) minus (1 minus ×)=?

× + × minus ×^2 minus (×+2× minus 3×^2)=?

3(×^2+2× minus 3) minus (3×^2 + 6× minus 9)=?

7× minus (3× minus 4×) + (× minus 1×)=?

×+×+× minus ×^4= 3× minus 4×^4=1×^4=?

2a minus minus a=?

Ma ajuati va rog frumos??

Answer 1

×^2-×^2-5×+1+5×=1
-×+1-1+×=0
2×-×^2-×-2×+3×^2=-×+2×^2
3×^2-9-3×^2-6×+9=-6×
7×-3×+4×+×-+=8×
3×-x^4=3×-4×^4=×^4(asta nu înțeleg cum e)
2a-(-a)=2a+a=3a