a,x-235=445
x= 445 + 235
x = 680
vậy x= 680
b, 546 - (x - 123) = 239
x-123= 546 - 239
x-123 = 307
x=307+ 123
x= 430
vậy x= 430
c, 5. (x-17)+ 12= 122
5.(x-17)= 122 -12
5.(x-17) = 110
x-17= 110: 5
x-17= 22
x= 22+ 17
x= 39
Vậy x= 39
Bài 2.Tìm số tự nhiên x biết:
a,x-235=445
x=445+235
x=680
Vậy x=680
b,546-(x-123)=239
x-123=546-239
x-123=307
x=307+123
x=430
c,5.(x-17)+12=122
5(x-17)=122-12
5(x-17)=110
x-17=110:5
x-17=22
x=22+17
x=39
a, x=445+235
x=680
b, x-123=546-239
x-123=307
x=307+123=430
c là 5 phẩy bao nhiêu vậy bạn???
a,\(x-235=445\)
\(=>x=445+235\)
\(=>x=680\)
b,\(546-\left(x-123\right)=239\)
\(=>x-123=546-239=307\)
\(=>x=307+123=430\)
c,\(5.\left(x-17\right)+12=122\)
\(=>5.\left(x-17\right)=122-12=5.22\)
Tiếp : \(=>x-17=22\)
\(=>x=22+17=39\)
\(a,x-235=445\Leftrightarrow x=680\)
\(b,546-\left(x-123\right)=239\)
\(x-123=307\Leftrightarrow x=430\)
\(c,5\left(x-17\right)+12=122\)
\(5x-85=110\)
\(5x=195\Leftrightarrow x=39\)
