A) (x-10).11=22 b) 2x +15 =-27 c) -765-(305 + x)=100 d) 2 mũ x:4=16 e) 25<5 mũ x<3125 f) (17x-25):8 + 65+ 9 mũ 2 g) 5.(12-x)-20=30 h) (50-6x).18= 2 mũ 3.3 mũ 2. 5 i) 128-3(x+4)=23 k) [(4x+28).3+55]:5=35 l) (3x- 2 mũ 4).7 mũ 3=2.7 mũ4 z)43+(9-21)=317-(x+317) (x+1)+(x+2)+(x+3)+.....+(x+100)=7450 giải nhanh giúp em ạ

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`a) (x - 10) . 11 = 22`

`⇔ x - 10 = 22 : 11`

`⇔ x - 10 = 2`

`⇒ x = 2 + 10`

`⇒ x = 12`

`b) 2x +15 =-27`

`⇒ 2x = -27 - 15`

`⇒ 2x = -42`

`⇒ x = -42 : 2`

`⇒ x = -21`

`c) -765-(305 + x)=100`

`⇔ 305 + x = -765 - 100`

`⇔ 305 + x = - 865`

`⇒ x = -865 - 305`

`⇒ x = -1170`

`d) 2^x : 4 = 16`

`⇒ 2^x = 16 . 4`

`⇒ 2^x = 64`

`⇔ 2^x = 2^6`

`⇒ x = 6`

`e) 25 < 5^x < 3125`

`⇔ 5^2 < 5^x < 5^5`

`⇒ 2 < x < 5`

`⇒ x ∈ { 3 ; 4 }`

`f) (17x-25):8 + 65 =  9^2`

`⇔ (17x-25):8 + 65 = 81`

`⇔ (17x-25):8 = 81 - 65`

`⇔ (17x-25):8 = 16`

`⇔ 17x - 25 = 16 . 8`

`⇔ 17x - 25 = 128`

`⇒ 17x = 128 + 25`

`⇒ 17x = 153`

`⇒ x = 153 : 17`

`⇒ x = 9`

`g) 5.(12-x)-20=30`

`⇔ 5.(12-x) = 30 + 20`

`⇔ 5.(12-x) = 50`

`⇒ 12 - x = 50 : 5`

`⇒ 12 - x = 10`

`⇒ x = 12 - 10`

`⇒ x = 2`

`h) (50-6x).18= 2^3 . 3 ^2. 5`

`⇔ (50-6x).18= 8 . 9 . 5`

`⇔ (50-6x).18= 360`

`⇔ 50 - 6x = 360 : 18`

`⇔ 50 - 6x = 20`

`⇒ 6x = 50 - 20`

`⇒ 6x = 30`

`⇒ x = 5`

`i) 128-3(x+4)=23`

`⇔ 3(x + 4) = 128 - 23`

`⇔ 3(x + 4) = 105`

`⇔ x + 4 = 105 : 3`

`⇔ x + 4 = 35`

`⇒ x = 35 - 4`

`⇒ x = 31`

`k) [(4x+28). 3+55] : 5=35`

`⇔ (4x+28). 3+55 = 35 . 5`

`⇔ (4x+28). 3+55 = 175`

`⇔ (4x+28). 3 = 175 - 55`

`⇔ (4x+28). 3 = 120`

`⇔ 4x + 28 = 120 : 3`

`⇔ 4x + 28 = 40`

`⇒ 4x = 40 - 28`

`⇒ 4x = 12`

`⇒ x = 12 : 4 = 3`

`l) (3x- 2^4 ). 7^3= 2. 7^4`

`⇔ 3x- 2^4 = 2. 7^4 : 7^3`

`⇔ 3x- 2^4 = 2 . 7`

`⇔ 3x - 16 = 14`

`⇒ 3x  = 14 + 16`

`⇒ 3x = 30`

`⇒ x = 10` 

`z)43+(9-21)=317-(x+317)`

`⇔ 43 + 9 - 21 = 317 - x - 317`

`⇔ 31 = -x`

`⇒ x = -31`

`j) (x+1)+(x+2)+(x+3)+.....+(x+100)=7450`

`⇔ 100 x + (1 + 2 + 3 + ... + 100) = 7450`

`⇔ 100x + 5050 = 7450`

`⇔ 100x = 2400`

`⇒ x = 2400 : 100`

`⇒ x = 24`