Răspunsuri

2014-07-25T20:26:23+03:00
2)a=√3 +√5= 1,73+ 2,23= 3,94

b=√7 +1= 2,64 +1= 3,64

3,94 > 3,64
   a    >    b

3)mg=√ab

mg=√(√7-√3)(√7+√3)= √7-3=  √4=2

6)(2x-3)(2x+3) + 4(x-1)² +8(x+1)= 4x²-9 +4(x²-2x+1)+8x+8=

=4x²- 9 +4x² -8x +4+8x +8=

=8x² -9+8=

=8x²-1= (2x√2-1)(2x√2+1)
1 5 1