\(100+23+x=469\) \(567-x=278-35\) \(x-120=403+60\)
\(123+x=469\) \(567-x=243\) \(x-120=463\)
\(x=469-123\) \(x=567-243\) \(x=463+120\)
\(x=346\) \(x=324\) \(x=583\)
Vậy x = 346 Vậy x = 324 Vậy : x = 583
a) 100+23+x=469
\(\Leftrightarrow123+x=469\)
\(\Leftrightarrow x=469-123\)
\(\Leftrightarrow x=346\)
b) 567-x = 278-35
\(\Leftrightarrow567-x=243\)
\(\Leftrightarrow x=567-243\)
\(\Leftrightarrow x=324\)
100 + 23 + x = 469
123 + x = 469
x = 469 - 123
x = 346
567 - x = 278 - 35
567 - x = 243
x = 567 - 243
x = 324
x - 120 = 403 + 60
x - 120 = 463
x = 463 + 120
x = 583
hok tốt
100+23+x=469
23+x=469-100
23+x=369
x=369-23
x=346
567-x=278-35
567-x=243
x=567-243
x= 324
x-120=403+60
x-120= 463
x=463+120
x= 583
\(100+23+x=469\Leftrightarrow123+x=469\Leftrightarrow x=346\)
\(567-x=278-35\Leftrightarrow567-x=243\Leftrightarrow x=324\)
\(x-120=403+60\Leftrightarrow x-120=463\Leftrightarrow x=583\)
x - 120 = 403 + 60
x - 120 = 463
x = 463 + 120
x = 583
