Đáp án:
Giải thích các bước giải:
$x:5=123$
$x=123×5$
$x=615$
$b)x:7=41$
$x=41×7$
$x=287$
$c)x+123=267$
$x=267-123$
$x=144$
$3hm=300m$
$5km=5000m$
$8dam=80m$
$15m=15m$
$34dm=3,4m$
$31m=310dm$
$9dam=900dm$
$3m=3000mm$
$12dm=1200mm$
x: 5= 123
x= 123x5
x=615
x:7=41
x=41x7
x=287
x+123 = 267
x=267-123
x= 144
3hm=300
5km=5000m
8dam=80m
15m=15m
34dm=3,4m
31m=310dm
9 dam= 900dm
3m=3000mm
12dm=1200mm
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