Podaj przeciwną do liczby x i liczbę odwrotną do y.
a)
x= (3 1/4 - 1,5) * ( -2 1/8 + 1/4)
y= (2,25 - 3 1/2) : 2/3 + 1/8
b)
x= (1 1/6 - 1/9) : (1 1/3 - 1/6)
y= (1/7 - 1/3) * 0,35 - 1 1/3 : (- 1 1/2)
Oblicz.
a) 23 : (- 7 2/3) - 32/24
b) (-2 3/5) * 3 1/8 + 1/8
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a)
x= (3 1/4 - 1,5) * ( -2 1/8 + 1/4) = (13/4 - 6/4) * (-17/8 + 2/8) = 7/4 * (-15/8) = -105/32
przeciwna do x = 105/32
y= (2,25 - 3 1/2) : 2/3 + 1/8 = (9/4 - 14/4) *3/2 + 1/8 = -5/4 *3/2 + 1/8 = -15/8 + 1/8 = -14/8
odwrotna do y = -8/14
b)
x= (1 1/6 - 1/9) : (1 1/3 - 1/6) = (7/6 - 1/9) : (8/6 - 1/6) = (21/18 - 2/18) : 7/6 = 19/18 * 6/7 = 19/3 * 1/7 = 19/21
przeciwna do x = -19/21
y= (1/7 - 1/3) * 0,35 - 1 1/3 : (- 1 1/2) = (3/21 - 7/21) * 7/20 - 4/3 * (-2/3) = -4/21 * 7/20 + 8/9 = -4/60 + 8/9 = -1/15 + 8/9 = -3/45 + 40/45 = 37/45
odwrotna do y = 45/37
Oblicz.
a) 23 : (- 7 2/3) - 32/24 = 23 : (-23/3) - 4/3 = 23 * (-3/23) - 4/3 = -3 -4/3 = -9/3 - 4/3 = -13/3
b) (-2 3/5) * 3 1/8 + 1/8 = -13/5 * 25/8 + 1/8 = -13 * 5/8 + 1/8 = -65/8 + 1/8 = -64/8 = -8