Question

11. 12. (8+(4-2)]+[9-(3+1)). [(6-1)-(3-2)]-[(9-7)-(6-5)].​

Answer 1

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• 11:

(8+(4-2)]+[9-(3+1))

8+4−2+9−(3+1)

=8+2+9−(3+1)

=10+9−(3+1)

=10+9−4

=10+5

=15

• 12:

[(6-1)-(3-2)]-[(9-7)-(6-5)]

6−1−(3−2)−(9−7−(6−5))

=5−(3−2)−(9−7−(6−5))

=5−1−(9−7−(6−5))

=4−(9−7−(6−5))

=4−(2−(6−5))

=4−(2−1)

=4−1

=3