Correct answer: BRL 20.50
1st step: we solve the multiplications inside the parentheses.
100 - [ ( 3. 1,80 ) + ( 4. 2,50 ) + ( 12. 2,60 ) + 3,40 + ( 5. 5,90 ) ] =
100 - [ 5,4 + 10 + 31,2 + 3,40 + 29,5 ]
2nd step: we solve the sums inside the square brackets.
100 - [ 5,4 + 10 + 31,2 + 3,40 + 29,5 ] = 100 - 79,50
3rd step: we solve the last operation, which is subtraction.
100 - 79,50 = 20,50
Therefore, the change received by Ana is R$ 20.50.
Correct answer: 277
1st step: we solve the multiplication.
174 + 64 x 3 - 89 = 174 + 192 - 89
2nd step: as addition and subtraction have the same priority, we solve the addition first, as it appears before the subtraction.
174 + 192 - 89 = 366 - 89
3rd step: we solve the last operation, which is subtraction.
366 - 89 = 277
Therefore, 174 + 64 x 3 - 89 = 277
Correct answer: 29
1st step: we solve the potencies.
33 + 23 - 3 x 2 = 27 + 8 - 3 x 2
2nd step: we solve the multiplication.
27 + 8 - 3 x 2 = 27 + 8 - 6
3rd step: as addition and subtraction have the same priority, we solve the sum first, as it appears before the subtraction.
27 + 8 - 6 = 35 - 6
4th step: we solve the last operation, which is subtraction.
35 - 6 = 29
Therefore, 33 + 23 - 3 x 2 = 29
Correct answer: 170
1st step: we solve the radiciation.
378 - 52. √400: √25 = 378 - 52. 20: 5
2nd step: as multiplication and division have the same priority, we solve multiplication first, as it appears before division.
378 - 52. 20: 5 = 378 - 1040: 5
3rd step: we solve the division.
378 - 1040: 5 = 378 - 208
4th step: we solve the last operation, which is subtraction.
378 - 208 = 170
Therefore, 378 - 52. √400: √25 = 170
Correct answer: 836
1st step: we solve the operation inside the parentheses.
900 - 4. 2. ( 3 + 5 ) = 900 - 4. 2. 8
2nd step: we solve the multiplications.
900 - 4. 2 .8 = 900 - 8. 8 = 900 - 64
3rd step: we solve the last operation, which is subtraction.
900 - 64 = 836
Therefore, 900 - 4. 2. ( 3 + 5 ) = 836
Correct answer: 144
1st step: we solve the powers and then the subtraction inside parentheses.
24 + [ 25. ( 23 - 22 ) ] = 24 + [ 25. (8 - 4) ] = 24 + [ 25. 4 ]
2nd step: we solve the power and, later, the multiplication inside the square brackets.
24 + [ 25. 4 ] = 24 + 32. 4 = 24 + [ 32. 4 ] = 24 + 128
3rd step: we solve the potency.
24 + 128 = 16 + 128
4th step: we solve the last operation, which is the addition.
16 + 128 = 144
Therefore, 24 + [ 25. ( 23 - 22 ) ] = 144
Correct answer: 1
1st step: we solve the operation inside the parentheses.
1440: { 30. [ 20 + ( 49 - 35 ). 2 ] } = 1440: { 30. [ 20 + 14. 2 ] }
2nd step: we solve the operations inside the square brackets, starting with multiplication and then addition.
1440: { 30. [ 20 + 14. 2 ] } = 1440: { 30. [ 20 + 28] } = 1440: { 30. 48 }
3rd step: we solve the multiplication inside the keys.
1440: { 30. 48 } = 1440: 1440
4th step: we solve the last operation, which is the division.
1440: 1440 = 1
Therefore, 1440: { 30. [ 20 + ( 49 - 35 ). 2 ] } = 1
