Question

tìm số tự nhiên x biết

a)2.x - 138 =\(^{^{ }2}^{^3.}^{3^2}\)

b)231 - (x-6)=1339:13

Answer 1

a) 2 . x - 138 = 2³ . 3²

2 . x - 138 = 8 . 9

2 . x - 138 = 72

2 . x = 72 + 138

2 . x = 210

     x = 210 : 2

     x = 105

b) 231 - ( x - 6 ) = 1339 : 13

231 - ( x - 6 ) = 103

x - 6 = 231 - 103

x - 6 = 128

     x = 128 + 6

     x = 134

Answer 2

a, 2x-138=32.9

2x-138=288

2x=288+138

2x=426

x=213

b, 231-(x-6)=103

x-6=231-103

x-6=128

x=134