a) 12 + x = 16
=> x = 16 - 12
=> x = 4
b) 89 + 2x = 564
=> 2x = 564 - 89
=> 2x = 475
=> x = 237 ,5
12+x=16
x=16-12
x=4
89+x.2=564
x.2=564-89
x.2=475
x=475:2
x=237,5
mik bổ sung thêm.
89 + 2x = 564
= 2x = 564 - 89
= 2x = 475
= 237,5
\(12+x=16\)
\(\rightarrow x=4\)
\(89+x.2=564\)
\(\rightarrow x=237,5\)