Question

6 Calculaţi: a 46: 23+{78-3-[(15+7.5): 5]-3-7};
b.9×{8+7 [6+5 (4+3 (2+1))]}: (1+2+3+...+ 9);
c1+2.{3+4:[5-6:(7-8:(9–1))]}
am nevoie doar de punctul b repede va rog dau coroana!​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

46 : 23 + {78 - 3 - [(15 + 7×5) : 5 ] - 3 - 7 } =

= 2 + {78 - 3 - [(15 + 35) : 5 ] - 3 - 7 } =

= 2 + {75 - [50 : 5 ] - 3 - 7 } =

= 2 + (75 - 10 - 3 - 7 ) =

= 2 + ( 65 - 3 - 7) =

= 2 + ( 62 - 7) =

= 2 + 55 =

= 57

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b).

9×{8+7× [6+5 ×(4+3× (2+1))]}: (1+2+3+...+ 9)=

= 9×{8+7× [6+5 ×(4+3× 3)]} : ( 9×10 : 2 ) =

= 9×{8+7× [6+5 ×13]} : 45

= 9×{8+7× [6+65]} : 45

= 9× ( 8 + 7×71) : 45

= 9 × ( 8 + 497) : 45

= 9 × 505 : 45

= 4545 : 45 =

= 101

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c

1+2×{3+4:[5-6:(7-8:(9–1))]} =

= 1 + 2×{3+4:[5-6:(7-8:8)]} =

= 1 + 2×{3+4:[5-6:(7- 1)]} =

= 1 + 2×{3+4:[5-6: 6]} =

= 1 + 2×{3+4:[5- 1 ]} =

= 1 + 2× ( 3 + 4 : 4 ) =

= 1 + 2 × ( 3+1) =

= 1 + 2×4 =

= 1 + 8 =

= 9