Ratujcie ..
Temat : Proporcje, a/b=c/d
Rozwiąż równania :
a) 3/x=5/7
b)8/3,5=4/y
c)5/6=1+t/10
d)1/z-1=6,5/8
e)2x-5/3=45
f)10/1,5=8/9-3x
Pomocy . :(
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a) 3/x=5/7
5x=21/:5
x=21/5
x=4 1/5
b)8/3,5=4/y
8y=14/:8
y=14/8
y=1 6/8
y=1 3/4
c)5/6=1+t/10
6(1+t)=50
6+6t=50
6t=50-6
6t=44/:6
t=7 2/6= 7 1/3
d)1/z-1=6,5/8
6,5z-6,5=8
6,5z=8+6,5
6,5z=14,5/:6,5
z=145/65
z=2 15/65
z=2 5/13
e)2x-5/3=45
2x-5=135
2x=135+5
2x=140/:2
x=70
f)10/1,5=8/9-3x
10(9-3x)=8*1,5
90-30x=12
-30x=12-90
-30x=-78/:-30
x=78/30
x=2 18/30
x=2 3/5