Question

va rooooooooog mult de tot am nevoie....
ofer coroana si multe multe puncte​

Answer 1

Răspuns:

Explicație pas cu pas:

-

a)

=11+[ -15+ (+5-12 -21+25 ) +8]

=11+ [ -15+ ( -7-21+25)+8]

=11+ [ -15+( -28+25)+8]

= 11+ (-15-3+8)

= 11+(-18+8)

=11-10

=1

-

-

b)

=[(-4-13)-(-10-5) +8]  -(10-6+24-28+16)

= [( -17)-(-15)+8]- ( 28-28+16)

= (-17+15+8)- 16

=(-2+8)-16

= 6-16

= -10

-

29)

a)

-1-2-3 -....-200= - ( 1+2+3+.....+200)

=(200-1):1+1= 199+1=200 ( nr de termeni )

S= (200+1)x200:2

S= 2001*100

S= 20.100....................S= suma

-

b)

-2-4-6-.....-324 = - ( 2+4+6+.....+324)

=(324-2):2+1  

=322:2+1= 162  (nr de termeni )

S= (324+2)*162:2

S= 326*81

S= 26.406 ....................S= suma

-

c)

-3-6-9-......-501=- (3+6+9+....+501)

=(501-3):3+1

=498:3+1

= 166+1

= 167  ( nr de termeni )

S= (501+3)*167:2

S= 504:2*167

S=252*167

S= 42.084 ...................S=suma

-

d)

-1-5-9 -.......- 405 = -( 1+5+9+.....+405)

=(405-1) :4 +1

= 404:4+1

= 101+1

= 102 ( nr de termeni )

S= (405+1)*102:2

S= 405*51

S= 20.706 ....................S= suma