1) 3*(2х-1)-2*(2-4х)=7 2) (4х+5)*(9х-1)=0 помогите решить)). Created by mongol125. matematika-ru

1) 3*(2х-1)-2*(2-4х)=7 2) (4х+5)*(9х-1)=0 помогите решить...

miron2077

Verified answer

6х-3-4+8х=7
14х=14
х=1

36х²+45х-4х-5=0
36х²+41х-5=0
х₁=-41+√(1681+720) = -41+49 = 8 = 1/9
72 72 72
х₂=-41-√(1681+720) = -41-49 =-90 = -5/4=-1,25
72 72 72

Дeниc 6х - 3 - 4 + 8х - 7 = 0
14х - 14 = 0
14х = 14
х = 1

36х^2 - 4x + 45x - 5 = 0
36x^2 - 41x - 5 = 0
41 +- корень{ (41^2 - 4 * 36 * (-5) }
x1,2=----------------------------------------------------
36 * 2
41 + корень (2401) 41+ 49 90 45 9 1
x1=------------------------------------= -----------=----------= ------= 1 -----= 1-----
72 72 72 36 36 4
41 - корень (2401) 41 - 49 -8 -1 1
х2=----------------------------------=-------------= --------= ----- = - ----
72 72 72 9 9

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