23+[67-{56-78+(45-78)}]
451-[67-{56-78+(45-78)}]
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1
Answer:
1.
23+(67-{56-78+(-47)})
23+67-{56-(-31)})
23+(67-87)
23+(-20)
=3
2.
451-(67-{56-78+(45-78)})
451-(67-{56-78+(-47)})
451-(67-{56-(-31)})
451-(67-87)
451-(-20)
=471
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