kochani pomozecie....
zadanie 1.wyznacz stosunek wielkosci
a.120kg i 3 t.
b.150mm i 20 dm
c.36s i 6 h.
d.4m kwadratowe i 25dm kwadraowe.
e.5 ha i 15 a.
f.5m/s i 30 km/h
zadanie2.z podanego rownania wyznacz wskazana niewiadomą
a.3x+a=2x+1,a
b.2(x+m)=m-4x+5,m
c.-x+a+b=2a-3b-2x, x
d.x-3(n+2x}=4n+2x ,x
zadanie 3.z podanego wzoru wyznacz niewiadomą x wiedząc ze wszystkie niewiaome są licbami dodatnimi.
a.ax +bc=4d
b.3nx-4m=nx+bn
c.-4ax+b=2ax-c
d.3px-b+c=7px+4c
dziekuje,pozdrawiam.
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1. a) 120 kg:3 t = 120 kg:3000 kg = 12:300 = 1:25
b) 150 mm:20 dm = 150 mm:2000 mm = 15:200 = 3:40
c) 36 s:6 h = 36 s:360 min = 36 s: 21600 s = 36:21600 = 1:600
d) 4 m^2:25 dm^2 = 400 dm^2:25 dm^2 = 400:25 = 16:1
e) 5 ha:15 a = 500 a:15 a = 500:15 = 100:3
f) 5 m/s:30 km/h = 5 m/s:30000 m/h = 5 m/s:500 m/min = 300 m/min:500 m/min = 300:500 = 3:5
2.a) 3x+a=2x+1 / -3x
a=-x+1
b) 2(x+m)=m-4x+5
2x+2m=m-4x+5 / -m-2x
m=-6x+5
c) -x+a+b=2a-3b-2x / +2x-a-b
x=a-4b
d) x-3(n+2x)=4n+2x
x-(3n+6x)=4n+2x
x-3n-6x=4n+2x / +3n+6x
x=7n+8x
3. a) ax+bc=4d / -bc
ax=4d-bc / :a
x=
b) 3nx-4m=nx+bn / -nx
2nx-4m=bn / +4m
2nx=bn+4m / :2n
x=
c) -4ax+b=2ax-c / +4ax
b=6ax-c / +c
6ax=b+c / :6a
x=
d) 3px-b+c=7px+4c / -3px
-b+c=4px+4c / -4c
4px=-b-3c / :4p
x=