1.I⅔×(1/√4-3⅔×1.5)÷√4/25I=
Oblicz 54%liczby
2.znajdz liczbe ktorej 30%wynosi
3⅗+1.8×3⅓
________________=
√6.25-2.1÷8⅖×2
3.Oblicz jakim procentem liczby 10jest wartosc wyrazenia
0.8-(√1.44÷2⅖-⅘)÷(√1/64)+2×1450⁰=
to jest na ocene dam naj naj..
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1.
Oblicz 54%liczby
I⅔×(1/√4-3⅔×1.5)÷√4/25I=
= | ⅔*( ½ - 11/3*3/2) : ⅖ | =
= | ⅔*(½ - 11/2) *25/2 | =
= | ⅔*( - 10/2)*5/2 | =
= | ⅔*(- 5)*5/2 | =
= | ⅔*(-25/2) |=
= | - 25/3 | =
= 25/3
54% z 25/3 = ( 54/100)*(25/3 ) = 18/4 = 4,5
2.znajdz liczbe ktorej 30% wynosi
3⅗+1.8×3⅓
________________=
√6.25-2.1÷8⅖×2
18/5 + (18/10)*(10/3)
= ---------------------------- =
2,5 - (21/10)*(5/42)*2
18/5 + 6
= ------------ =
2,5 - 0,5
3,6 + 6
= ---------- =
2
9,6
= ------- = 4,8
2
30% = 4,8
100% = x
30%*x = 4,8*100%
x = 4,8*100% : 30%
x = 16
Odp. 30% z liczby 16 = 4,8
3.Oblicz jakim procentem liczby 10jest wartosc wyrazenia
0.8-(√1.44÷2⅖-⅘)÷(√1/64)+2×1450⁰=
= 0,8 - ( 1,2 : 12/5 - 4/5) : ¼ + 2*1 =
= 0,8 - [( 12/10)*(5/12) - 4/5 ] *4 + 2 =
= 0,8 - [ ½ - 4/5 ] *4 + 2 =
= 0,8 - [ 5/10 - 8/10 ]*4 +2 =
= 0,8 - [ -3/10]*4 + 2 =
= 0,8 - (- 12/10) + 2 =
= 0,8 - (- 1,2) + 2 =
= 0,8 + 1,2 +2 =
= 4
100% = liczba 10
x% = 4
10*x = 4*100
x = 4*100:10
x = 40%
Odp. Liczba 4 jest to 40% liczby 10