Question

Ma ajutati va rog ? . Daca se poate ... rezorvalile complete

Answer 1

1)3(4+√3)-√27∈N
√27=3√3
12+3√3-3√3=12∈N
2)f(x)=2x+3
f(1)+(f(2)+....+f(10)=
f(1)=2*1+3=2+3=5
f(2)=2*2+3=4+3=7
f(3)=3*2+3=6+3=9
f(4)=4*2+3=8+3=11
f(5)=5*2+3=10+3=13
f(6)=6*2+3=12+3=15
f(7)=7*2+3-14+3=17
f(8)=8*2+3=16+3=19
f(9)=9*2+3=18+3=21
f(10)=10*2+3=23
f(1)+f(2).....+f(10)=140

3)㏒₇(x²+8)=㏒₇6x
avem aceaesi baza
CE=X²+8≥0
x²+8=6x⇒
x²-6x+8=
a=4
b=-6
c=8
Δ=b²-4ac⇒36-32⇒Δ=4⇒√Δ=√4⇒Δ=2
x1x2=-b+-√Δ/2a
x1=6+2/2⇒8/2⇒x1=4
x2=6-2/2⇒4/2⇒x2=2
4)x⇒pretul initial
x+30x/100=325
numitorul comun este 100
100x+30x/100=325⇒
130x/100=325⇒
130x=32500⇒
x=32500/130⇒
x=250

5)P(1.3)R(3.3)
Q=mijlocul lui PR
Xα+Xb/2=1+3/2=4/2=2
Yα+Yb/2=3+3/=6/2=3
Q(2.3).

6)sin10+sin30-sin170=1/2
sin 170=sin(180-alfa)⇒sin(180-170)=sin10
sin10+sin30-sin10=
sin30=1/2
adevarat
sucees la bac d le elev a