Toán Lớp 6: a 7X-5=16 b 156-2X=82 c 10X+65=125 d 8X+2X=25.2^2

Question

Toán Lớp 6:  a 7X-5=16 b 156-2X=82 c 10X+65=125 d 8X+2X=25.2^2

minhtuquynh · Answer

a) 7x - 5 = 16        7x          = 16 + 5       7x          = 21       x              = 21 : 7       x              = 3   Vậy x = 3   b) 156 - 2x = 82                     2x = 156 - 82                     x = 74 : 2                       x = 37    Vậy x = 37   c) 10x + 65 = 125        10x              = 125 - 65        10x               = 60              x               = 60 : 10              x               = 6   Vậy x = 6                         d) 8x + 2x  = 25. 2^{2}        8x + 2x  = 25. 4        8x + 2x  = 100         x . ( 8 + 2 ) = 100         x . 10 = 100         x            = 100 : 10         x            = 10   Vậy x = 10

thaolanphuobg · Answer

a, $7x-5=16$   $&rArr;7x=21$ $&rArr;x=3$   Vậy $x=3$   b, $156-2x=82$ $&rArr;2x=74$ $&rArr;x=37$ Vậy $x=37$ c, $10x+65=125$ $&rArr;10x=60$ $&rArr;x=6$ Vậy $x=6$   d, $8x+2x=25.2^2$ $&rArr;10x=100$ $&rArr;x=10$   Vậy $x=10$