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b) 1/12 * 1,2 =1/10
c) 3 1/2 * ( -2 2/3)=- 9 i 1/3
d) - 2/3 * ( - 5/6)=-5/9
e) - 2,5 * ( - 0,8) * ( - 1)=-2
a) 2/3 * ( - 0,125) =
= 2/3*(-1/8)=
= - 1/12
b) 1/12 * 1,2 =
= 1/12 *12/10=
= 1/12*6/5=
= 1/10
c) 3 1/2 * ( -2 2/3)=
=7/2*(-8/3) =
= - 28/3
= -9 i 1/3
d) - 2/3 * ( - 5/6)=
= (-2/3)*(-5/6)=
= 5/9
e) - 2,5 * ( - 0,8) * ( - 1)=
= (-25/10)*(-8/10)*(-1)=
= (-5/2)*(4/5)*(-1) =
= - 2
f) - 8,52 * ( - 1,8) * ( - 2)=
= - 30,672
g) -4 * ( - 1,5) * ( - 10) * ( - 2,2)=
= 132
h) - 3,8 * ( - 5) * ( - 2) * ( - 6,1) * ( -1)=
= - 231,8
2.Oblicz, pamiętając o kolejności wykonywania działań:
a) - 1/2 * 4/5 - ( - 0,8) * 5/6 =
= - 4/10 - (-4/5)*(5/6)=
= - 2/5 - (-2/3)=
= -2/5 + 2/3 =
= - 6/15 + 10/15=
= 4/15
b) 1 - ( 1 - 2/3) * ( 2/3 - 1) =
= 1 - ( 1/3)*(-1/3) =
= 1 - (-1/9)=
= 1 + 1/9 =
= 1 i 1/9
c) 2,25 * ( - 1,6) + ( - 19,5) : ( -2 1/2) =
= -3,6 + ( -19,5): (-2,5) =
= -3,6 + 7,8 =
= 4,2
d) - 2,4 * ( - 2/7) * 5/6 * 14 =
= - 12/5 *(*-2/7) *(5/6)*14 =
= 8
e) ( - 5,8) : 4/5 + ( - 7,45) : 7,65 - 10,15 =
= (-29/5)*5/4 + ( -745/100)*(100/765) - 10,15 =
=(-29/4) - 745/765 - 10,15=
= (-29/4) - 149/153 - 1015/100 =
= (- 4437/612 )- 596/612 - 203/20 =
= -5033/612 - 293/20 =
= - 100660/12240 - 124236/12240 =
= - 224896/12240
= -18 i 4576/12240