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P=k:r / *r
Pr=k / : P
r=k/P
2)B
n=0.8b / :0,8
n:0,8=b
b=n*1,25
3)D
P=(a*h):2 / *2
2p=a*h / :a
h=2p:2
na pewno dobrze
1)C
4/(x-3)=6/(2x)
mnożymy na krzyż
4*2x=(x-3)*6
8x=6x-18
2)D
3/5=x/(x+12)
3x+36=5x
36=2x
x=18