Question

măcar cântevaaaaaaaa​

Answer 1

l.1.-7/30(-5/7)+2/18:(-1/9)=

+5/30+1/18(-9/1)=

1/6-(1/18)×9=

1/6-³1/2=-2/6=-1/3 b)

2.5x-6=14

5x=20

x=4 d)

3.aria ∆ dreptunghic=c1×c2/2

A=4×3/2=6cm²b)

4.40%X+90=X

X-(40/100)X=90 /×10

10X-(400/100)X=900

10X-4X=900

6X=900

X=150km c)

5.diagonala pătrat=latura √2

d=7√2cm c)

6.x²-5x+6=0

x²-3x-2x+6=0

x(x-3)-2(x-3)=0

(x-3)(x-2)=0

soluțiile (3;2) a)

l l.1.[2x/(x-1)-x/(x+1)]:(2x²+6x)/(x²+2x+1)

x=R\{-3;-1;0;1}

a)x=2

.[2x/(x-1)-x/(x+1)]:(2x²+6x)/(x²+2x+1)

(4/1-2/3):(8+12)/(4+4+1)=

10/3:20/9=10/3×9/20=3/2

b)[(2x²+2x-x²+x)/(x²-1)]:[2x(x+3)/(x+1)²]=

[(x²+3x)/(x²-1)]×[(x+1)/2x(x+3)]=

[x(x+3)/(x²-1)]×[(x+1)²/2x(x+3)]=

se reduc x+3;x;x+1.

=(x+1)/2(x-1)

c)P=2(a-1)E(a)=N

P=2(a-1)(a+1)/2(a-1)= observăm 2(a-1) se reduce

P=a+1 unde a natural =>a+1 natural