Oblicz:
Znak "oznacza do potęgi,
a) -1,8*2/3-0,8*(-3/4)"2
-0,9*5/9+(-1/2)
b) -2*(0,5)"2+(-2)
-0,1*[-1,3+6*(-0,2)]
jest to w książce do 1 gimnazjum 'Matematyka 1' na str.41 zad.14
z góry dziex;*
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a)
-1,8 * 2/3 - 0,8 * (-3/4)"2 =
= -18/10 * 2/3 - 8/10 * 9/16 =
= 6/5 - 9/20 =
= 24/20 - 9/20 =
= 15/20 =
= 3/4
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-0,9 * 5/9 + (-1/2) =
= -9/10 * 5/9 - 1/2 =
= -1/2 - 1/2 =
= -0,5 - 0,5 =
= -1
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b)
-2 * (0,5)"2 + (-2) =
= -2 * 0,25 - 2 =
= -0,5 - 2 =
= -2,5
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-0,1 * [-1,3 + 6 * (-0,2)] =
= -0,1 * [-1,3 + (-1,2)] =
= -0,1 * [-1,3 - 1,2] =
= -0,1 * -2,5 =
= 0,25