Question

= 3 Află numărul necunoscut. a) 5 x (24 x 17 +52 25 - a) = 0 C-(24 x 48-20 (52 - 47)] = 297 b) 18 x 3 + bx [(72-5 x 12) - 2) = d) 12 x 25 x 5 - 2 x (d +4) = 240 va rog REPEDE
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Answer 1

Răspuns:

a)

5 x (24 x 17 +52x25 - a) = 0

5x(408+1300-a)=0

5x(1708-a)=0

(1708-a)=0:5

1708-a=0

a=1708-0

a=1708

b)

18 x 3 + bx [(72-5 x 12) - 2) =?

54+b x[(72-60)-2]=?

54+b x(12-2)=?

54+bx10=?

nu scrie cu cât este egal

c)

c-(24 x 48-20x(52 - 47)] = 297

c-(1152-20x5)=297

c-(1152-100)=297

c-1052=297

c=297+1052

c=1349

d)

12 x 25 x 5 - 2 x (d +4) = 240

300x5-2x(d+4)=240

1500-2x(d+4)=240

2x(d+4)=1500-240

2x(d+4)=1260

(d+4)=1260:2

d+4=630

d=630-4

d=626

Answer 2

Explicație pas cu pas:

a)

5 × (24 × 17 + 52 × 25 - a) = 0

5 × (408 + 1300 - a) = 0

5 × (1708 - a) = 0 |:5

1708 - a = 0

1708 = a

a = 1708

b)

18 × 3 + b × [(72 - 5 × 12) - 2] =

54 + b × [(72 - 60) - 2] =

54 + b × (12 - 2) =

54 + b × 10 =

c)

c - [24 × 48 - 20 × (52 - 47)] = 297

c - (1152 - 20 × 5) = 297

c - (1152 - 100) = 297

c - 1052 = 297

c = 297 + 1052

c = 1349

d)

12 × 25 × 5 - 2 × (d + 4) = 240

300 × 5 - 2 × (d + 4) = 240

1500 - 2 × (d + 4) = 240

1500 = 240 + 2 × (d + 4)

1500 - 240 = 2 × (d + 4)

1260 = 2 × (d + 4) |:2

630 = d + 4

630 - 4 = d

d = 630 - 4

d = 626

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