Oblicz poniższe przykłady pamiętając o kolejności wykonywania działań:
a) [⅖ - (-0,4) : (-0,12)] : [4-(-44)] =
b) 0,75 * (-4/5) - 2½ * (-0,24) =
c) (-6) * [2-(-3) + 2 * (-1) =
d) (-1⅓) * (-0,75) - 1⅓
----------------------- =
1/9 - 0,8 : 1⅗
4/5 to ułamek
-------------- to kreska ułamkowa
1/9 to ułamek
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a) [2/5 -(-0,4) : (-0,12)]:[4-(-44)= [2/5 -(-2/5) :(-12/100)]:[4+44] =
= [2/5-(-2/5)*(-100/12)]:48 = [2/5-(-1/1)*(-20/6)];48=[2/5-20/6]:48=
= [12/30-100/30] :48 = -88/30 : 48 = -88/30*1/48=-11/30*1/6=-11/180
b) 0,75*(-4/5)-2i 1/2*(-0,24)= 3/4*(-4/5)-5/2*(-24/100 )= 3/1*(-1/5)- 1/1*(-12/20) =
= -3/5 + 12/20 = - 12/20 + 12/20 = 0
c) (-6) *[2-(-3) +2*(-1)] = (-6)* [2+3 -2] = (-6)* 3 = - 18
d) (-1i1/3)*(-0,75) - 1i1/3 (-4/3)* (-3/4) - 1 i1/3 (-1/1)*(-1/1) -1i1/3
____________________ = ___________________ = ___________________ =
1/9 - 0,8 :1,6 1/9- 1/2 2/18 - 9/18
1 -1 i1/3 -1/3
_____________ = _______ = -1/3 : (-7/18) = -1/3 *(-18/7)= -1/1*(-6/7)= 6/7
- 7/18 - 7/18