Matematică, întrebare adresată de paulatasbirec23, 9 ani în urmă

VA ROG EXERCITIILE 6,7,8,9 ,rezolvarile COMPLETE

Anexe:

renatemambouko: la ex.8 nu se vad bine puterile lui 7 , scrie exercitiul aici
renatemambouko: 6)
x 2/3+ 1 x/6=4
(3x+2)/3+ (6+x)/6=4
6x+4+6+x=24
7x=14
x=2
paulatasbirec23: 7 la puterea 91 - 7 la puterea 89 supra 7 la puterea 92 +7 la puterea 92
paulatasbirec23: am grasit sapte la putera 91
paulatasbirec23: plus 7 la 92
renatemambouko: 7.
[0,625:0,2(7)-2]² ×5,(3)=
=[625/1000:(27-2)/90-2]² ×(53-5)/9=
=[5/8:25/90-2]² ×48/9=
=[5/8 ×90/25-2]² ×16/3=
=[5/8 ×18/5-2]² ×16/3=
=[18/8-2]² ×16/3=
=[9/4-2]² ×16/3=
=[(9-8)/4]² ×16/3=
=(1/4)² ×16/3=
=1/16×16/3=
=1/3

Răspunsuri la întrebare

Răspuns de renatemambouko
1
6)
x 2/3+ 1 x/6=4
(3x+2)/3+ (6+x)/6=4
6x+4+6+x=24
7x=14
x=2

7.
[0,625:0,2(7)-2]² ×5,(3)=
=[625/1000:(27-2)/90-2]² ×(53-5)/9=
=[5/8:25/90-2]² ×48/9=
=[5/8 ×90/25-2]² ×16/3=
=[5/8 ×18/5-2]² ×16/3=
=[18/8-2]² ×16/3=
=[9/4-2]² ×16/3=
=[(9-8)/4]² ×16/3=
=(1/4)² ×16/3=
=1/16×16/3=
=1/3

8.
(7^91 - 7^89) /(7^91 +7^92)=
=7^89(7^2 - 7^0) /7^91(7^0 +7^1)=
=(49 - 1) /7^2(1 +7)=
=48 /49×8=
=6/49

9.
(x+x/3)/2=34
x+x/3=68
3x+x=204
4x=204
x=51









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