Question

Aflai X :
Va rog day coroana !!

Answer 1

pentru a putea face calcule transformam doar intr-o singura unitate de masura, preferabil cea mai mica(aici va fi mm)
-stim ca 1cm=10mm
a.
L=14cm +8mm=140mm+8mm=148mm
l=8cm+9mm=80mm+9mm=89mm
x=L-l=148-89=59mm pe care-l putem scrie ca 50mm+9mm=5cm9mm
(am impartit pe 59 la 10 si partea intreaga este numarul de cm, iar restul este nr. de mm)

b.
notam l1=6cm7mm=67mm
l2=14cm8mm=148mm
x=l1+l2=205mm=20cm5mm

c,
L=12cm5mm=125mm
l1=2/3*x
l2=x
stim ca l1+l2+L, deci
2/3*x+x=125  /inmultim cu 3 ambii membri
2x+3x=375
5x=375
x=375/5=75mm=7cm5mm

d.
L=x
l1=1/3*x
l2=11cm2mm=112mm
avem x=1/3*x+112 /inmultim cu 3
3x=x+336
2x=336
x=168mm=16cm8mm

Answer 2

a . 14 cm 8 mm - 8 cm 9mm=5 cm 9 mm
b .6 cm 7 mm + 11 cm 2 mm=17 cm 9 mm
c . X=12 cm 5 mm: 5/3=125/10:5/3=25/10•3/1=75/10=7,5
d.11 cm 2 mm =2/3 x
x-1/3x=2/3x
1/3x=2/3:2
1/3x=11 cm 2 mm:2
11 cm 2 mm+5 cm 6 mm=16 cm 8mm