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b) 6,51 - 2,775 - 11,125= - 7,39
c) -10/9=9-1/6)+9 3/4 - (6,25) = -10/9 ( góra i dół razy 6) -1/6 ( góra i dół razy 9) + 39/4 - 6,25 = - 60/54 - 9/54 + 39/4- 6.25 = - 69/54 + 39/4 - 6,25 = - 269/216 ( góra i dół razy 4) + 2106/216 ( góra i dół razy 54) - 6,25 = 1837/216 - 6,25 =8.504 - 6.25 = 2.25 = 2 25/216
b)6,51+(-2,775)-11,125=6,51-2,775-11,125=6,51-13,9=-7,39
c)-10/9+(-1/6)+9 i 3/4-(-6,25)=-10/9-1/6+39/4+625/100=
=-10/9-1,6+39/4+25/4=-40/36-6/36+351/36+225/36=-46/36+576/36=
=530/36=14 i 26/36=14 i 13/18
d)-9,3-(-12 i 1/2)-(72,8-(-13,002))=-9,3+12,5-(72,8+13,002)=
=-9,3+12,5-85,802=-95,102+12,5=-82,602