2 câu trả lời
X+x+40=42
X+x+40=42-40
X+x+40=2
x = 2:2
vậy : X = 1
x=1
X : 5 +18=100
X : 5 + 18=100-18
X:5+18 = 82
X= 82x5
x = 410
nên x=410
a) $x+x+40=42$
$2x=42-40=2$
$→x=2:2=1$
b) $x:5+18=100$
$x:5=100-18=82$
$→x=82.5=410$
X+x+40=42
X+x+40=42-40
X+x+40=2
x = 2:2
vậy : X = 1
x=1
X : 5 +18=100
X : 5 + 18=100-18
X:5+18 = 82
X= 82x5
x = 410
nên x=410
a) $x+x+40=42$
$2x=42-40=2$
$→x=2:2=1$
b) $x:5+18=100$
$x:5=100-18=82$
$→x=82.5=410$