Question

Bài 1: a,315+2x=x+115 b,25-(30-x)=25-(-12+125) c,412-(40-2x)=72+x

Answer 1

a) 315 + 2x = x+115

<=> 2x-x = 115-315

<=> x = -200

Vậy x= -200

Answer 2

b) 25-(30-x)=25-(-12+125)

<=> 25-30+x = -88

<=> -5 + x =-88

<=> x = -83

Vậy x=-83

Answer 3

c) 412-(40-2x) = 72+x

<=> 412-40+2x=72+x

<=> 372 + 2x = 72+x

<=> 2x-x = 72-372

<=> x= -300

Vậy x=-300

Answer 4

a, 315+2.x=x+115

    2.x-x     =(115-315)

    x           =-200

Answer 5

a, 315+2.x=x+115

    2.x-x     =(115-315)

    x           =-200