Question

Urgeent!Nu toatee,cate stiti:)
99 puncteeeeeeeee

Answer 1

2)a=|2√7-8|=8-2√7
b=|2√7+8|=2√7+8
mg=√a•b=√(8-2√7)(8+2√7)=√[8²-(2√7)²]
=√(64-28)=√36=6
mg=6
4x²=6 1/4
4x²=25/4
x²=25/4:4
x²=25/4•1/4
x²=25/16
x=√25/√16=5/4 sau x=-5/4
4)(√3+√6)²-(√2-√3)²=
=√3²+2•√3•√6+√6²-(√2²-2•√2•√3+√3²)
=3+6√2+6-2+2√6-3
=4+6√2+2√6
5)|2x-3|=7
2x-3=7 sau 2x-3=-7
2x=7+3 2x=-7+3
2x=10 2x=-4
x=10/2 x=-4/2
x=5 x=-2
7)∆ABC is.
AD perpendicular pe BC=>∆ADB=∆dr.
DB=32:2=16 cm
AB²=AD²+DB²
AB²=12²+16²
AB²=144+256
AB=√400=20 cm
L AB=Π•R•x°/180
L AB=Π•18•60° /180°
L AB=18,84 cm