Question

a-3.[4.(3+7) -2. (4×3-9) ]=
b-(8.9-22).[40-3.(7.5-2.1)]=
c-(18-4×3)+24-6×3)=
d-25-(4×5-8)=
e-8.(12-2.5)=
f-12+3×5-10=​

Answer 1

Resposta:

a)

3•[4•(3+7)-2•(4×3-9)] =

= 3•[4•(10)-2•(12-9)]

= 3•[40-2•(3)]

= 3•[40-6]

= 3•[34]

= 102

b)

(8•9-22)•[40-3•(7•5-2•1)] =

= (72-22)•[40-3•(35-2)]

= 50•[40-3•(33)]

= 50•[40 - 99]

= 50•[-59]

= - 2950

c)

(18-4×3)+24-6×3 =

= (18-12)+24-18

= (6)+6

= 6 + 6

= 12

d)

25 - (4 × 5 - 8) =

= 25 - (20 - 8)

= 25 - (12)

= 25 - 12

= 13

e)

8•(12-2×5) =

= 8•(12 - 10)

= 8• (2)

= 16

f)

12 + 3 × 5 - 10 =

= 12 + 15 - 10

= 27 - 10

= 17

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