a) x . 15 + x . 13 = 560 . 45
x ( 15 + 13 ) = 25 200
x . 28 = 25 200
x = 25 200 : 28
x = 900
b) x . 125 - x . 73 = 1196
x ( 125 - 73 ) = 1196
x . 52 = 1196
x = 1196 : 52
x = 23
X x 15 + X x 13 = 560 x 45
X x [ 15+13] = 25200
x * 18 = 25200
x = 25200 : 18
x = 1400
b, x*125-x*73=1196
x * [125-73]=1196
x*52=1196
x = 1196 : 52
x = 23
a> Ta có : x * 15 + x * 13 = 560 * 45
x * ( 15 + 13 ) = 25200
x * 28 = 25200
x = 25200 : 28
x = 900
b> ta có : x * 125 - x * 73 = 1196
x * ( 125 - 73 ) = 1196
x * 52 = 1196
x = 1196 : 52
x = 23
# chúc bạn học tốt ạ #
a) 15x+13x=560.45
2x=25200
x=25200:2
x=12600
b) 125x-73x=1196
52x=1196
x=1196:52
x=23