Odpowiedź:
zad 7
a) 0,75-5*(-5)=0,75+25=25,75
b)1,5-4-10=-12,5
c)4(1,5*2)=4-3=1
d)(3i3/8) / 3+1=(9/8)+1=2i1/8
zad 8
liczba ujemna jest w działaniach:
-3,4-9i3/7
(1i2/3)+(-7,3)
(-1,3)2
3,4/(-6,1)
6-(-4,7)2
76,9*(8/11-78)
(4i2/7)-(1,2-92)
1000-(20i1/9)*10
-7i3/11+(-2,72)/98
Szczegółowe wyjaśnienie:
Mam nadzieję, że ci dosyć dużo pomogłam.
7.
a)
3/4 * 5 * (2 - 7) = 0,75 * 5 * (-5) = 0,75 * (-25) = -18,75
b)
3/2 - (7 - 3) - 10 = 1,5 - 4 - 10 = 1,5 - 14 = 12,5
c)
4 - (3 - 1,5) * 2 = 4 - 1,5 * 2 = 4 - 3 = 1
d)
(1 3/8 + 2) : 3 + 1 = 3 3/8 : 3 + 1 = 27/8 * 1/3 + 1 = 7/8 + 1 = 1 7/8
8.
-3,4 - 9 3/7 = -3 2/5 - 9 3/7 = -3 14/35 - 9 15/35 = -12 29/35
7/8 - (-8,4) = 0,875 + 8,4 = 9,275
-2,8 + 3 1/9 = -2 4/5 + 3 1/9 = -2 27/45 + 3 5/45 = -2 27/45 + 2 50/45 = 23/45
1 2/3 + (-7,3) = 1 2/3 - 7 1/10 = 1 20/30 - 7 3/30 = 1 20/30 - 6 33/30 = -5 13/30
(-1,3)³ = -2,197
3,4 : (-6,1) = -34/61
6 - (-4,7)² = 6 - 22,09 = -16,09
76,9 * (8/11 - 78) = 76,9 * (-77 3/11) = 76 9/10 * (-850/11) = -769/10 * 850/11 =
= 65365/11 = 5942,(27)
-2 3/4 * (-9,8) = -2,75 * (-9,8) = 26,95
4 2/7 - (1,2 - 92) = 4 2/7 - 90,8 = 4 2/7 - 90 4/5 = 4 10/35 - 90 28/35 =
= -86 18/35
4 - 1 3/4 : (-2/5) = 4 - 1,75 : (-0,4) = 1 + 4,375 = 5,375
1000 - 20 1/9 * 10 = 1000 - 181/9 * 10 = 1810/9 = 201 1/9
-7 3/11 + (-2,72) : 98 = -7 3/11 - 2 18/25 * 1/98 = 7 3/11 - 68/25 * 1/98 =
= 7 3/11 - 34/25 * 1/49 = 7 3/11 - 34/2450 = 7 3/11 - 17/1225 =
= 7 3675/13475 - 187/13475 = 7 3488/13475
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Odpowiedź:
zad 7
a) 0,75-5*(-5)=0,75+25=25,75
b)1,5-4-10=-12,5
c)4(1,5*2)=4-3=1
d)(3i3/8) / 3+1=(9/8)+1=2i1/8
zad 8
liczba ujemna jest w działaniach:
-3,4-9i3/7
(1i2/3)+(-7,3)
(-1,3)2
3,4/(-6,1)
6-(-4,7)2
76,9*(8/11-78)
(4i2/7)-(1,2-92)
1000-(20i1/9)*10
-7i3/11+(-2,72)/98
Szczegółowe wyjaśnienie:
Mam nadzieję, że ci dosyć dużo pomogłam.
Odpowiedź:
7.
a)
3/4 * 5 * (2 - 7) = 0,75 * 5 * (-5) = 0,75 * (-25) = -18,75
b)
3/2 - (7 - 3) - 10 = 1,5 - 4 - 10 = 1,5 - 14 = 12,5
c)
4 - (3 - 1,5) * 2 = 4 - 1,5 * 2 = 4 - 3 = 1
d)
(1 3/8 + 2) : 3 + 1 = 3 3/8 : 3 + 1 = 27/8 * 1/3 + 1 = 7/8 + 1 = 1 7/8
8.
-3,4 - 9 3/7 = -3 2/5 - 9 3/7 = -3 14/35 - 9 15/35 = -12 29/35
7/8 - (-8,4) = 0,875 + 8,4 = 9,275
-2,8 + 3 1/9 = -2 4/5 + 3 1/9 = -2 27/45 + 3 5/45 = -2 27/45 + 2 50/45 = 23/45
1 2/3 + (-7,3) = 1 2/3 - 7 1/10 = 1 20/30 - 7 3/30 = 1 20/30 - 6 33/30 = -5 13/30
(-1,3)³ = -2,197
3,4 : (-6,1) = -34/61
6 - (-4,7)² = 6 - 22,09 = -16,09
76,9 * (8/11 - 78) = 76,9 * (-77 3/11) = 76 9/10 * (-850/11) = -769/10 * 850/11 =
= 65365/11 = 5942,(27)
-2 3/4 * (-9,8) = -2,75 * (-9,8) = 26,95
4 2/7 - (1,2 - 92) = 4 2/7 - 90,8 = 4 2/7 - 90 4/5 = 4 10/35 - 90 28/35 =
= -86 18/35
4 - 1 3/4 : (-2/5) = 4 - 1,75 : (-0,4) = 1 + 4,375 = 5,375
1000 - 20 1/9 * 10 = 1000 - 181/9 * 10 = 1810/9 = 201 1/9
-7 3/11 + (-2,72) : 98 = -7 3/11 - 2 18/25 * 1/98 = 7 3/11 - 68/25 * 1/98 =
= 7 3/11 - 34/25 * 1/49 = 7 3/11 - 34/2450 = 7 3/11 - 17/1225 =
= 7 3675/13475 - 187/13475 = 7 3488/13475
Szczegółowe wyjaśnienie: