Răspuns:
Explicație pas cu pas:
a/b = 1,25 = 125/100 = 5/4
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a)
a/b : 7/8 = 5/4 : 7/8 = 5/4*8/7 = 10/7
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b)
a/b : (-5) = 5/4 : (-5) = 5/4*(-1/5) = -1/4
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c)
(-5*a) : b/2 = -5*a*2/b = -10*a/b = -10*5/4 = -50/4 = -25/2 = -12,5
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d)
a/5 : (-b/4) = a/5*(-4/b) = -4/5*a/b = -4/5*5/4 = -1
