Răspuns:
Explicație pas cu pas:
a) 76 : ( - 19 ) = - 4
b) - 56 : ( - 8 ) = + 7
c) - 0,81 : 1,8 = - ( 81/100) : ( 18/10) = - ( 81/100) × ( 10/18) =
= - (81/18) ×(10/100) =
= - (81:9)/(18:9) × 1/10 =
= - 9/(2×10) =
= - 9/20 =
= - 0,45
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d)
-> introduc intregii in fractie
7 intregi si 4/5 = (7×5+4)/5 = 39/5
1 intreg si 11/15 = (1×15+11)/15 = 26/15
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- 39/5 : ( 26/15 ) = - 4 intregi si 1/2 = - 4,5
= (- 39/5 ) × (15/26) =
= - (39/26) × (15/5) =
= - (39:13)/(26:13) × 3 =
= - (3×3)/2 =
= - 9/2 =
= - 4 intregi si 1/2 =
= - 4,5
