Proszę o dobre rozwiązania i dobre obilczenia z zadań z piątku oraz zadania 4,5,6
4.
1/3d + 2/5 d + 1/10d+ 2,5m=d
10/30d + 12/30d + 3/30d + 2,5m=d
25/30d + 2,5m=d
2,5m=5/30d=1/6d
d=15m
6.
0,63n=u
4n+23=10u
4n+23=0,63*10n
4n+23=6,3n
23=2,3n
n=10zł
u=6,3zł
5.
(5+x)(x-3)=x² + 100cm²
5x-15+x²-3x=x²+100
2x-15=100
2x=115
x=57,5
Ob=(5+57,5)*2+(57,5-3)*2=125+109=234 cm²
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
4.
1/3d + 2/5 d + 1/10d+ 2,5m=d
10/30d + 12/30d + 3/30d + 2,5m=d
25/30d + 2,5m=d
2,5m=5/30d=1/6d
d=15m
6.
0,63n=u
4n+23=10u
4n+23=0,63*10n
4n+23=6,3n
23=2,3n
n=10zł
u=6,3zł
5.
(5+x)(x-3)=x² + 100cm²
5x-15+x²-3x=x²+100
2x-15=100
2x=115
x=57,5
Ob=(5+57,5)*2+(57,5-3)*2=125+109=234 cm²