oblicz jakim procentem liczby 20 jest: 90 , 150, 0,2 , 1,6
a) 90/20 ·100% = 900/2% = 450%
b) 150/20 ·100% = 15000/20% = 1500%/20 = 750%
c) 0,2/20 ·100% = 20%/20 = 1%
d) 1,6/20 ·100%= 160%/20 = 8%
ROZWIĄZANIE:
90/20*100%=450%150/20*100%=750%
0,2/20*100% =1%
1,6/20*100%=8%
lub jak wolisz to tak:
wyjaśnienie:
--- oznacza myślnik
90----X
20---100%
20x=90*100%
20X=9000%
x=9000%/20
X=450%
150---x
20x=150*100%
20x=15000%
x=15000%/20
x=750%
0,2---x
20x=0,2*100%
20x=20
x=20%/20
x=1%
1,6---x
20x=1,6*100%
20x=160%
x=160%/20
x=8%
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a) 90/20 ·100% = 900/2% = 450%
b) 150/20 ·100% = 15000/20% = 1500%/20 = 750%
c) 0,2/20 ·100% = 20%/20 = 1%
d) 1,6/20 ·100%= 160%/20 = 8%
ROZWIĄZANIE:
90/20*100%=450%
150/20*100%=750%
0,2/20*100% =1%
1,6/20*100%=8%
lub jak wolisz to tak:
wyjaśnienie:
--- oznacza myślnik
90----X
20---100%
20x=90*100%
20X=9000%
x=9000%/20
X=450%
150---x
20---100%
20x=150*100%
20x=15000%
x=15000%/20
x=750%
0,2---x
20---100%
20x=0,2*100%
20x=20
x=20%/20
x=1%
1,6---x
20---100%
20x=1,6*100%
20x=160%
x=160%/20
x=8%