hilfe bei der mathematik hausübung bitte?

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1 Antwort

1.)7/12 x (-4) = -4 x 7/12 = (-4*7)/12 = (-1*4*7)/12 = -28/12 = - 7*4/4*3 = -7/3

2.)5:(5/8)= 5 x (8/5) = 5 x 8/5 = (5*8)/5 = 40/5 = 8


3.) [(-0,75) + (-1/2)] : (-1 3/4) =

= [(-1)*(750/1000)]+(-1/2) : ((-1)*((1*4)+3)/4) =

= [(-1)*(75/100)]-1/2 : (-1)*((4+3)/4) =

= ( [(-1)*(3*25)/(4*25)] - 1/2 ) : (-7/4) =

= (-3/4 - 1/2) : (-7/4) =

= (-3/4 - 2/4) : (-7/4) =

= [(-3-2)/4] : (-7/4)=

= -5/4 x (-4/7)=

= [(-5)*(-4)] / [4*7] =

=20/28=

=(5*4)/(7*4)=

= 5/7

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