Matematică
ingerrooz
33

Rezolvati ecuatiile : a) 2x+7=15 b) 3x-11=21 c) 5+2(x-1) =12 d) 3(x-3)-8=20 e) 15-4(x+1)=10 f )x- 2 supra 3 = 1pe langa si 1supra 15 g) 3 supra 4 -x = 1 supra 12 h) 7 supra 18 + x = 19 supra 15 i) 9 • x = 12 j) x • 4 supra 25 = 16 supra 5 k) 35 supra 24 : x = 2 , (3) l ) 4x+5 = x + 13 m ) 11x + 17 = 2 x + 21 n) 3x - 1 supra 2 = 3 supra 7 - 4 x o ) 3 supra 22 x - 1 supra 2 = 6 supra 55 + 1 supra 11 x p) x supra 2 - x supra 3 = 7 supra 6

+3
(1) Răspunsuri
localizat

a) 2x+7=15  2x=8 x=4 b) 3x-11=21  3x=32 x=32/3 c) 5+2(x-1) =12  2(x-1)=7 x-1=7/2 x=7/2+1 x=9/2 d) 3(x-3)-8=20  3x=20+8+9 x=37/3 e) 15-4(x+1)=10  4x+4=5 4x=1 x=1/4 f )x- 2/3 = 1 1/15  1 1/15 =16/15 x=16/15+2/3 x=(16+10)/15 x=26/15 g) 3/4 -x = 1/12  x=3/4-1/12 x=(9-1)/12 x=8/12 h) 7/18 + x = 19/15  x=19/15-7/18 x=(114-35)/90 x=79/90 i) 9 • x = 12  x=12/9=4/3 j) x • 4/25 = 16/5 x=16/5 : 4/25 x=16/5 * 25/4 x=20   k) 35/24 : x = 2,(3)  2,(3)=(23-2)/9=21/9=7/3 35/24:x=7/3 x=35/24:7/3 x=35/24 * 3/7 x=5/8 l ) 4x+5 = x + 13  3x=8 x=8/3 m ) 11x + 17 = 2x + 21  9x=4 x=4/9 n) 3x - 1/2 = 3/7 - 4 x 7x=3/7+1/2 7x=(6+7) /14 7x=13/14 x=13/98 o ) 3x/22 - 1/ 2 = 6/55 + x/11  3x/22-x/11=6/55+1/2 (3x-2x)/22 =(12+55)/110           x/22=67/110 x=67/5 p) x/2 - x/3 = 7/6  3x-2x =7 x=7

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