URGENTTT!! DAU CORONITA!!
1) Rezolvati in multimea numerelor reale ecuatiile:
a) 2(x- √5) = √500
b) (2x-1) : √75= √147
c) √12 (x+√3)=6-√48
d) 3[√147-√12(x-5)]=√243
e) √3(√675-x√54)=√27(√24+√75)
f) x(√5-2)^2-1=√20(2-√5)
2) Rezolvati in multimea numerelor reale ecuatiile:
a) √x^2=5
b) √(x-1)^2=3
c) √(x+3)^2= 12
d) √(2x+1)^2=15
e) √(1-3x)=11
f) √(4x-1)^2=19
g) √4x^2-4x+1=7
VA ROGG E URGEENTT SI E PENTRU MAINEE :((
andreikzro:
(2x-1)/√75=√147 asa e ? 147 sau 144?
Răspunsuri la întrebare
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2
2(x-√5)=√500
a)
2x-2√5=√5×100
2x=2√5+10√5
2x=12√5
x=6√5
b)
(2x-1)/√75=√147
2x-1=√75×√147
2x=1+5√3×√3×49
2x=1+5√3×7√3
2x=1+35×3
2x=1+105
2x=106
x=53
c)
√12(x+√3)=6-√48
2√3(x+√3)=6-4√3
2√3x+6=6-4√3
2√3x=-4√3
x=-2
d)
3[√147-√12(x-5)]=√243
3(√147-√12x+5√12)=√243
3√147-3√12x+15√12=√243
3√3×49-3×2√3x+15×2√3=√3×81
3×7√3-6√3x+30√3=9√3
21-6x+30=9
6x=42
x=7
e)
√3(√675-x√54)=√27(√24+√75)
√3(√5×135-x√6×9)=√3×9(√6×4+√3×25)
√3(√5×5×3×9-x√6×9)=√3×9(√6×4+√3×25)
√3(15√3-3x√6=3√3(2√6+5√3)
45-3x√6=18√2+45
3x√3×2=18√2
3x√3=18
x√3=6
x=6/√3
x=2√3
f)
x(√5-2)^2-1=√20(2-√5)
x(5-4√5+4)-1=2√5(2-√5)
x(9-4√5)=4√5-10+1
x(9-4√5)=4√5-9
x=-(4√5-9)/(4√5-9)
x=-1
2)
a)
2x-2√5=√5×100
2x=2√5+10√5
2x=12√5
x=6√5
b)
(2x-1)/√75=√147
2x-1=√75×√147
2x=1+5√3×√3×49
2x=1+5√3×7√3
2x=1+35×3
2x=1+105
2x=106
x=53
c)
√12(x+√3)=6-√48
2√3(x+√3)=6-4√3
2√3x+6=6-4√3
2√3x=-4√3
x=-2
d)
3[√147-√12(x-5)]=√243
3(√147-√12x+5√12)=√243
3√147-3√12x+15√12=√243
3√3×49-3×2√3x+15×2√3=√3×81
3×7√3-6√3x+30√3=9√3
21-6x+30=9
6x=42
x=7
e)
√3(√675-x√54)=√27(√24+√75)
√3(√5×135-x√6×9)=√3×9(√6×4+√3×25)
√3(√5×5×3×9-x√6×9)=√3×9(√6×4+√3×25)
√3(15√3-3x√6=3√3(2√6+5√3)
45-3x√6=18√2+45
3x√3×2=18√2
3x√3=18
x√3=6
x=6/√3
x=2√3
f)
x(√5-2)^2-1=√20(2-√5)
x(5-4√5+4)-1=2√5(2-√5)
x(9-4√5)=4√5-10+1
x(9-4√5)=4√5-9
x=-(4√5-9)/(4√5-9)
x=-1
2)
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