Bài 1
a, \(25+5x=25\Leftrightarrow x=0\)
b, \(45-3x=0\Leftrightarrow3x=45\Leftrightarrow x=15\)
c, \(1-24:\left(30-x\right)=0\Leftrightarrow24:\left(30-x\right)=1\Leftrightarrow30-x=24\Leftrightarrow x=6\)
Bài 1
a, 25 + 5x = 25
x = 0
b, 45 − 3x = 0
3x = 45
x=15
c, 1 − 24 : (30−x) = 0
24 : (30−x) = 1
30 − x = 24
x = 6
Bài 2
a, 13 + 21 . 5 - ( 198 : 18 - 5 )
= 643
b, 234 . 981 + 981 . 766 + 2345 : 5
= 981 469
c, mik hog bt lm
Tick đúng cho mik nha