Răspuns:
Explicație pas cu pas:
a) ( 100 - 75 ) - [ 20 + ( 15 - 70 ) - ( 88 - 18 + 40 ) ] = 170
= 25 - [ 20 + (- 55 ) - ( 70 + 40 ) ] =
= 25 - ( 20 - 55 - 110 ) =
= 25 - ( - 35 - 110 ) =
= 25 + 145 =
= 170
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b) 100 - { 30 + [ ( 88 - 54 ) - ( 400 - 380 ) ] + 60 } = - 4
= 100 - [ 30 + ( 34 - 20 ) + 60 ] =
= 100 - ( 30 + 14 + 60 ) =
= 100 - 104 =
= - 4
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c) 22 - { 22 - [ 22 - ( 40 - 22 ) + ( 88 - 22 ) - ( 88 - 40 ) ] } =22
= 22 - [ 22 - ( 22 - 18 + 66 - 48 ) ] =
= 22 - [ 22 - ( 4 + 18 ) ] =
= 22 - ( 22 - 22 ) ] =
= 22 - 0=
= 22
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d) 400 - { [ 23 - ( 123 - 100 ) ] - [ 59 + ( - 259 + 100 ) ] + 10 } = 290
= 400 - [ ( 23 - 23 ) - ( 59 - 159 ) + 10 ] =
= 400 - ( 0 + 100 + 10 ) =
= 400 - 110 =
= 290
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e) { 1 200 - [ 800 + ( - 1 450 + 750 ) -( 390 + 210 ) ] } - 400 = 1 300
= [ 1 200 - ( 800 - 700 - 600 ) ] - 400 =
= [ 1 200 - ( 100 - 600 ) ] - 400 =
= ( 1 200 + 500 ) - 400 =
= 1 700 - 400 =
= 1 300
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f) 1 - { 2 + ( 3 - 4 ) - [ 6 - ( 7 - 8 ) + ( 9 - 10 ) ] - 11 } + 12 = - 3
= 1 - [ 2 - 1 - ( 6 + 1 - 1 ) - 11 ] + 12 =
= 1 - ( 1 - 6 - 11 ) + 12 =
= 1 - 16 + 12 =
= - 15 + 12 =
= - 3
